Circadian rhythm
Ultradian rhythm
Slow-wave sleep
Heart rate variability
Sleep Stages
Sleep (system call)
Internal medicine
Free-running sleep
Polysomnography
Non-rapid eye movement sleep
Heart rate
Psychology
Wakefulness
Medicine
Endocrinology
Infradian rhythm
Cardiology
Electroencephalography
Blood pressure
Circadian clock
Light effects on circadian rhythm
Neuroscience
Apnea
Computer science
Operating system
