Assessment | Biopsychology | Comparative | Cognitive | Developmental | Language | Individual differences | Personality | Philosophy | Social |
Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |

Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology

The sleep wake cycle is a particular aspect of circadian rhythm and is the biological rhythm of sleep and wakefulness.

See alsoEdit

• Human biological rhythms
• Napping
• Sleep disorders
• Sleep hygiene
• Sleep onset