Wikia

Psychology Wiki

Changes: Circadian rhythm sleep disorders

Edit

Back to page

(Boxed)
(update wp)
 
Line 1: Line 1:
{{Boxtop}}
 
 
{{Infobox_Disease |
 
{{Infobox_Disease |
Name = {{PAGENAME}} |
+
Name = Circadian rhythm sleep disorder |
 
Image = |
 
Image = |
 
Caption = |
 
Caption = |
 
DiseasesDB = |
 
DiseasesDB = |
ICD10 = G47.2|
+
ICD10 = {{ICD10|G|47|2|g|40}} |
 
ICD9 = {{ICD9|327.3}} |
 
ICD9 = {{ICD9|327.3}} |
 
ICDO = |
 
ICDO = |
Line 12: Line 11:
 
eMedicineSubj = |
 
eMedicineSubj = |
 
eMedicineTopic = |
 
eMedicineTopic = |
  +
MeshID = D021081 |
 
}}
 
}}
{{Boxbottom}}
 
Circadian rhythm sleep disorders are a family of [[sleep disorders]] affecting the timing of sleep. People with circadian rhythm sleep disorders are unable to sleep and wake at the times required for normal work, school, and social needs. In general, they are able to get enough sleep if allowed to sleep when they want. Unless they have another sleep disorder, their sleep is of normal quality.
 
   
Humans have biological rhythms, known as [[circadian rhythm|circadian rhythms]], which are controlled by a biological clock and work on a daily time scale. Due to the circadian clock, sleepiness does not continuously increase as time passes. Instead, the drive for sleep follows a cycle, and the body is ready for sleep and for wakefulness at different times of the day.
+
'''Circadian rhythm sleep disorders''' are a family of [[sleep disorders]] affecting, among other things, the timing of sleep. People with circadian rhythm sleep disorders are unable to sleep and wake at the times required for normal work, school, and social needs. They are generally able to get enough sleep if allowed to sleep and wake at the times dictated by their body clocks. Unless they have another sleep disorder, their sleep is of normal quality.
  +
  +
Humans, like most animals and plants, have biological rhythms, known as [[circadian rhythm]]s, which are controlled by a biological clock and work on a daily time scale. These affect [[body temperature]], [[alertness]], [[appetite]], [[hormone]] secretion etc. as well as sleep timing. Due to the circadian clock, sleepiness does not continuously increase as time passes. A person's desire and ability to fall asleep is influenced by both the length of time since the person woke from an adequate sleep, and by internal circadian rhythms. Thus, the body is ready for sleep and for wakefulness at different times of the day.
   
 
== Types of circadian rhythm sleep disorders ==
 
== Types of circadian rhythm sleep disorders ==
Line 22: Line 20:
 
The circadian rhythm sleep disorders are:
 
The circadian rhythm sleep disorders are:
   
* [[Jet lag]], affecting people who travel across time zones.
+
====[[Extrinsic]] type====
* [[Shift work]]: People who work at night often have trouble sleeping during the day.
+
* [[Jet lag]], which affects people who travel across several time zones.
* [[Delayed sleep phase syndrome]] (DSPS), which causes difficulty falling asleep at night and waking up in the morning.
+
* [[Shift work sleep disorder]], which affects people who work nights or rotating shifts.
  +
  +
====[[Intrinsic]] type====
  +
* [[Delayed sleep phase syndrome]] (DSPS), which causes a much later than normal timing of sleep onset and offset and a period of peak alertness in the middle of the night.
 
* [[Advanced sleep phase syndrome]] (ASPS), which causes difficulty staying awake in the evening and staying asleep in the morning.
 
* [[Advanced sleep phase syndrome]] (ASPS), which causes difficulty staying awake in the evening and staying asleep in the morning.
* [[Non-24-hour sleep-wake syndrome]] causes patients to stay up later and later every night, then wake up later every morning.
+
* [[Non-24-hour sleep-wake syndrome]] (Non-24), which causes the affected individual's sleep to occur later and later each day, with the period of peak alertness also continuously moving around the clock from day to day.
* [[Irregular sleep-wake pattern]] presents as sleeping at very irregular times, and usually more than once per day (waking frequently during the night and taking naps during the day).
+
* '''Irregular sleep-wake pattern''', which presents as sleeping at very irregular times, and usually more than once per day (waking frequently during the night and taking naps during the day) but with total time asleep typical for the person's age.
   
 
== Normal circadian rhythms ==
 
== Normal circadian rhythms ==
   
Among people with healthy circadian clocks, there are "larks" or "morning people" who prefer to sleep and wake early, and there are "owls" who prefer to sleep and wake at late times. Whether they are larks or owls, people with normal circadian systems:
+
Among people with healthy circadian clocks, there is a continuum of [[chronotype]]s from "larks" or "morning people" who prefer to sleep and wake early, to "owls" who prefer to sleep and wake at late times. Whether they are larks or owls, people with normal circadian systems:
   
 
* can wake in time for what they need to do in the morning, and fall asleep at night in time to get enough sleep before having to get up.
 
* can wake in time for what they need to do in the morning, and fall asleep at night in time to get enough sleep before having to get up.
 
* can sleep and wake up at the same time every day, if they want to.
 
* can sleep and wake up at the same time every day, if they want to.
* will, after starting a new routine which requires they get up earlier than usual, start to fall asleep at night earlier too within a few days. For example, someone who is used to sleeping at 1 am and waking up at 9 am begins a new job on a Monday, and must get up at 6 am to get ready for work. By the following Friday, the person has begun to fall asleep at around 10 pm, and can wake up at 6 am and feel well-rested. This adaptation to earlier sleep/wake times is known as "advancing the sleep phase." Healthy people can advance their sleep phase by about one hour each day.
+
* will, after starting a new routine which requires they get up earlier than usual, start to fall asleep at night earlier within a few days. For example, someone who is used to sleeping at 1 am and waking up at 9 a.m. begins a new job on a Monday, and must get up at 6 a.m. to get ready for work. By the following Friday, the person has begun to fall asleep at around 10 p.m., and can wake up at 6 a.m. feeling well-rested. This adaptation to earlier sleep/wake times is known as "advancing the sleep phase." Healthy people can advance their sleep phase by about one hour each day.
   
Researchers have placed volunteers in caves or special apartments for several weeks without clocks or other time cues. Without time cues, the volunteers tended to go to bed an hour later and to get up about an hour later each day. These experiments demonstrate that the "free-running" circadian rhythm in humans is about 25 hours long. To maintain a 24 hour day/night cycle, the biological clock needs regular environmental time cues, e.g. sunrise, sunset, and daily routine. Time cues keep the human circadian clock aligned with the rest of the world.
+
Researchers have placed volunteers in caves or special apartments for several weeks without clocks or other time cues. Without time cues, the volunteers tended to go to bed an hour later and to get up about an hour later each day. These experiments appeared to demonstrate that the "free-running" circadian rhythm in humans was about 25 hours long. However, these volunteers were allowed to control artificial lighting and the light in the evening caused a phase delay. More recent research shows that adults of all ages free-run at an average of 24 hours and 11 minutes. To maintain a 24 hour day/night cycle, the biological clock needs regular environmental time cues or ''[[Zeitgeber]]s'', e.g. sunrise, sunset, and daily routine. Time cues keep the normal human circadian clock aligned with the rest of the world.<ref>{{cite web |url=http://science.education.nih.gov/supplements/nih3/sleep/guide/info-sleep.htm|title=Sleep - Information about Sleep|author=National Institutes of Health|accessdate=2007-01-28}}</ref>
   
 
== Circadian rhythm abnormalities ==
 
== Circadian rhythm abnormalities ==
  +
Non-24-hour sleep-wake syndrome and other persistent circadian rhythm sleep disorders are believed to be caused by an inadequate ability to reset the sleep/wake cycle in response to environmental time cues. These individuals' circadian clocks might have an unusually long cycle, and/or might not be sensitive enough to time cues. People with DSPS, more common than Non-24, do entrain to nature's 24 hours, but are unable to sleep and awaken at socially preferred times, sleeping instead, for example, from 4 a.m. to noon. According to doctors Cataletto and Hertz at WebMD, "Altered or disrupted sensitivity to [[Zeitgeber|zeitgebers]] is probably the most common cause of circadian rhythm disorder."<ref>{{cite web |url= http://www.emedicine.com/neuro/TOPIC655.HTM
  +
|title= Sleeplessness and Circadian Rhythm Disorder |accessdate= 2008-07-20 |last= Cataletto |first= Mary E. |coauthors= Hertz, Gila |date= Updated 2005-09-07 |format= Free registration required |work= |publisher= eMedicine from WebMD |pages= |doi= |quote= }}</ref>
   
Persistent circadian rhythm sleep disorders such as DSPS are believed to be caused by a reduced ability to reset the sleep/wake cycle in response to environmental time cues. For example, the circadian clocks of individuals with DSPS might have an unusually long cycle, or might not be sensitive enough to time cues.
+
As of October 1, 2005, the diagnostic codes for circadian rhythm sleep disorders were changed from the 307-group to the 327-group in the ''[[Diagnostic and Statistical Manual of Mental Disorders]], Fourth Edition, Text Revision'' (DSM-IV-TR). The DSM updated to agree with the ''[[International Classification of Diseases]]'' (ICD-9). The new codes reflect the moving of these disorders from the Mental Disorders section to the Neurological section in the ICD.<ref>{{cite web |url= http://psych.org/MainMenu/Research/DSMIV/DSMIVTR/CodingUpdates/NewDiagnosticCodesforSleepDisordersEffectiveOctober12005.aspx |title= New Diagnostic Codes for Sleep Disorders |accessdate= 2008-08-08 |last= First |first= Michael B. |year= 2005 |format= |work= |publisher= American Psychiatric Association |doi= |quote= }}</ref>
   
 
== See also ==
 
== See also ==
   
* [[Sleep log]]
+
* [[Chronobiology]]
* [[Zeitgeber]]
+
* [[Chronotype]]
  +
* [[Light therapy]]
 
* [[Melatonin]]
 
* [[Melatonin]]
* [[Ramelteon]]
+
* [[Phase response curve]]
* [[Light Therapy]]
+
* [[Sleep diary]]
  +
* [[Sleep medicine]]
  +
* [[Zeitgeber]], any external cue for time-keeping system of organisms such as light
   
 
== References ==
 
== References ==
  +
<references/>
   
[http://www.psychnet-uk.com/dsm_iv/circadian_rhythm_sleep_disorder.htm Circadian Rhythm Sleep Disorder on Psychnet-UK]
+
== External links ==
  +
* [http://www.psychnet-uk.com/dsm_iv/circadian_rhythm_sleep_disorder.htm Circadian Rhythm Sleep Disorder on Psychnet-UK]
  +
* [http://www.journalsleep.org/Articles/301107.pdf An American Academy of Sleep Medicine Review: ''Circadian Rhythm Sleep Disorders: Part I, Basic Principles, Shift Work and Jet Lag Disorders.'' PDF, 24 pages. November 2007.]
  +
* [http://www.journalsleep.org/Articles/301108.pdf An American Academy of Sleep Medicine Review: ''Circadian Rhythm Sleep Disorders: Part II, Advanced Sleep Phase Disorder, Delayed Sleep Phase Disorder, Free-Running Disorder, and Irregular Sleep-Wake Rhythm.'' PDF, 18 pages. November 2007.]
  +
* [http://www.nasa.gov/mission_pages/station/science/experiments/Sleep-Long.html NASA Sleep-Wake Actigraphy and Light Exposure During Spaceflight-Long Experiment]
   
{{med-stub}}
+
{{SleepSeries2}}
   
  +
{{Template:CNS diseases of the nervous system}}
   
 
[[Category:Sleep disorders]]
 
[[Category:Sleep disorders]]
  +
[[Category:Circadian rhythms]]
  +
[[Category:Neurophysiology]]
  +
[[Category:Sleep physiology]]
  +
  +
<!--
  +
[[ja:概日リズム睡眠障害]]
  +
[[no:Døgnrytmeforstyrrelse]]
  +
[[nn:Døgnrytmesjukdom]]
  +
[[ro:Dereglări ale Ritmului Circadian]]
  +
[[simple:Circadian rhythm sleep disorder]]
  +
-->
 
{{enWP|Circadian rhythm sleep disorders}}
 
{{enWP|Circadian rhythm sleep disorders}}

Latest revision as of 00:07, April 24, 2009

Circadian rhythm sleep disorder
ICD-10 G472
ICD-9 327.3
OMIM [1]
DiseasesDB [2]
MedlinePlus [3]
eMedicine /
MeSH {{{MeshNumber}}}


Circadian rhythm sleep disorders are a family of sleep disorders affecting, among other things, the timing of sleep. People with circadian rhythm sleep disorders are unable to sleep and wake at the times required for normal work, school, and social needs. They are generally able to get enough sleep if allowed to sleep and wake at the times dictated by their body clocks. Unless they have another sleep disorder, their sleep is of normal quality.

Humans, like most animals and plants, have biological rhythms, known as circadian rhythms, which are controlled by a biological clock and work on a daily time scale. These affect body temperature, alertness, appetite, hormone secretion etc. as well as sleep timing. Due to the circadian clock, sleepiness does not continuously increase as time passes. A person's desire and ability to fall asleep is influenced by both the length of time since the person woke from an adequate sleep, and by internal circadian rhythms. Thus, the body is ready for sleep and for wakefulness at different times of the day.

Types of circadian rhythm sleep disorders Edit

The circadian rhythm sleep disorders are:

Extrinsic typeEdit

Intrinsic typeEdit

  • Delayed sleep phase syndrome (DSPS), which causes a much later than normal timing of sleep onset and offset and a period of peak alertness in the middle of the night.
  • Advanced sleep phase syndrome (ASPS), which causes difficulty staying awake in the evening and staying asleep in the morning.
  • Non-24-hour sleep-wake syndrome (Non-24), which causes the affected individual's sleep to occur later and later each day, with the period of peak alertness also continuously moving around the clock from day to day.
  • Irregular sleep-wake pattern, which presents as sleeping at very irregular times, and usually more than once per day (waking frequently during the night and taking naps during the day) but with total time asleep typical for the person's age.

Normal circadian rhythms Edit

Among people with healthy circadian clocks, there is a continuum of chronotypes from "larks" or "morning people" who prefer to sleep and wake early, to "owls" who prefer to sleep and wake at late times. Whether they are larks or owls, people with normal circadian systems:

  • can wake in time for what they need to do in the morning, and fall asleep at night in time to get enough sleep before having to get up.
  • can sleep and wake up at the same time every day, if they want to.
  • will, after starting a new routine which requires they get up earlier than usual, start to fall asleep at night earlier within a few days. For example, someone who is used to sleeping at 1 am and waking up at 9 a.m. begins a new job on a Monday, and must get up at 6 a.m. to get ready for work. By the following Friday, the person has begun to fall asleep at around 10 p.m., and can wake up at 6 a.m. feeling well-rested. This adaptation to earlier sleep/wake times is known as "advancing the sleep phase." Healthy people can advance their sleep phase by about one hour each day.

Researchers have placed volunteers in caves or special apartments for several weeks without clocks or other time cues. Without time cues, the volunteers tended to go to bed an hour later and to get up about an hour later each day. These experiments appeared to demonstrate that the "free-running" circadian rhythm in humans was about 25 hours long. However, these volunteers were allowed to control artificial lighting and the light in the evening caused a phase delay. More recent research shows that adults of all ages free-run at an average of 24 hours and 11 minutes. To maintain a 24 hour day/night cycle, the biological clock needs regular environmental time cues or Zeitgebers, e.g. sunrise, sunset, and daily routine. Time cues keep the normal human circadian clock aligned with the rest of the world.[1]

Circadian rhythm abnormalities Edit

Non-24-hour sleep-wake syndrome and other persistent circadian rhythm sleep disorders are believed to be caused by an inadequate ability to reset the sleep/wake cycle in response to environmental time cues. These individuals' circadian clocks might have an unusually long cycle, and/or might not be sensitive enough to time cues. People with DSPS, more common than Non-24, do entrain to nature's 24 hours, but are unable to sleep and awaken at socially preferred times, sleeping instead, for example, from 4 a.m. to noon. According to doctors Cataletto and Hertz at WebMD, "Altered or disrupted sensitivity to zeitgebers is probably the most common cause of circadian rhythm disorder."[2]

As of October 1, 2005, the diagnostic codes for circadian rhythm sleep disorders were changed from the 307-group to the 327-group in the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision (DSM-IV-TR). The DSM updated to agree with the International Classification of Diseases (ICD-9). The new codes reflect the moving of these disorders from the Mental Disorders section to the Neurological section in the ICD.[3]

See also Edit

References Edit

  1. National Institutes of Health. Sleep - Information about Sleep. URL accessed on 2007-01-28.
  2. Cataletto, Mary E., Hertz, Gila Sleeplessness and Circadian Rhythm Disorder. (Free registration required) eMedicine from WebMD. URL accessed on 2008-07-20.
  3. First, Michael B. (2005). New Diagnostic Codes for Sleep Disorders. American Psychiatric Association. URL accessed on 2008-08-08.

External links Edit



|}

This page uses Creative Commons Licensed content from Wikipedia (view authors).

Around Wikia's network

Random Wiki