Related Experiment Video
Updated: Aug 14, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
Published on: August 8, 2019
[Sleep and normality: usefulness for the practitioner]
1Centre valaisan de pneumologie Centre hospitalier du Valais central 3963 Montana. Raphael.simon@admin.vs.ch
Abstract:
About fifty percent of patients consulting their primary care physician complain of sleep disorders. Clinicians have to distinguish normal from abnormal sleep. For example, sleep normality is usually characterised by an apnea/hypopnea index < 5 h(-1) in absence of sleep symptoms. However such an index varies in relation with age, gender, body mass index, measurements methods In daily clinical practice, clinicians should look for sleep symptoms to define an abnormal sleep. More studies are needed to better define which patient will really benefit from a specific sleep therapy.
Related Concept Videos
Sleep-Wake Cycles
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
Management of Insomnia
Nightmares and Night Terrors
Nightmares often...
Insufficient Sleep and Sleep Deprivation
Sleep deprivation is a more severe form of sleep loss...
Understanding Sleep
The circadian rhythm, a nearly 24-hour cycle, is deeply influenced by environmental light cues. Light exposure directly affects the hypothalamus, which in turn regulates...
Sedatives and Hypnotics Drugs: Miscellaneous Agents
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...

