A report on Sleep

A male and female lion sleeping on a flat plain

"The Awakening", an illustration to writing by Leo Tolstoy

The main health effects of sleep deprivation, indicating impairment of normal maintenance by sleep

Bronze statue of Eros sleeping, 3rd century BC–early 1st century AD

World War II poster issued by the US government

Dreams often feel like waking life, yet with added surrealism.

The Land of Cockaigne by Pieter Bruegel the Elder, 1567

Medieval manuscript illumination from the Menologion of Basil II (985 AD), showing the Seven Sleepers of Ephesus sleeping in their cave

The Sleep of Reason Produces Monsters (1799) by Francisco Goya

Diana and Endymion ({{circa}} 1822) by Jérôme-Martin Langlois

The Second Class Carriage (1864) by Honoré Daumier

Sleep and his Half-brother Death (1874) by John William Waterhouse

Lullaby (1875) by William-Adolphe Bouguereau

The Victory of Faith (1891) by Saint George Hare

Zwei schlafende Mädchen auf der Ofenbank (1895) by Albert Anker

Flaming June ({{circa}} 1895) by Frederic Leighton

Noon – Rest from Work (1890) by Vincent van Gogh (after Millet)

Sleeping Girl on a Wooden Bench by Albert Anker

Naturally recurring state of mind and body, characterized by altered consciousness, relatively inhibited sensory activity, reduced muscle activity and inhibition of nearly all voluntary muscles during rapid eye movement sleep, and reduced interactions with surroundings.

- Sleep

57 related topics with Alpha

Insomnia

12 links

Normison (temazepam) is a benzodiazepine commonly prescribed for insomnia and other sleep disorders.

Disability-adjusted life year for insomnia per 100,000 inhabitants in 2004.
no data
less than 25
25–30.25
30.25–36
36–41.5
41.5–47
47–52.5
52.5–58
58–63.5
63.5–69
69–74.5
74.5–80
more than 80

Insomnia, also known as sleeplessness, is a sleep disorder in which people have trouble sleeping.

Sample hypnogram (electroencephalogram of sleep) showing sleep cycles characterized by increasing paradoxical (REM) sleep.

Rapid eye movement sleep

8 links

EEG of a mouse that shows REM sleep being characterized by prominent theta-rhythm

Polysomnographic record of REM Sleep. EEG highlighted by red box. Eye movement highlighted by red line.

Rapid eye movement sleep (REM sleep or REMS) is a unique phase of sleep in mammals and birds, characterized by random rapid movement of the eyes, accompanied by low muscle tone throughout the body, and the propensity of the sleeper to dream vividly.

Sleep apnea

6 links

Screenshot of a PSG system showing an obstructive apnea.

Screenshot of a PSG system showing a central apnea.

Person using a CPAP mask, covering only the nose

Illustration of surgery on the mouth and throat.

Uvulopalatopharyngoplasty. A) pre-operative, B) original UPPP, C) modified UPPP, and D) minimal UPPP.

Sleep apnea, also spelled sleep apnoea, is a sleep disorder in which pauses in breathing or periods of shallow breathing during sleep occur more often than normal.

Stage N1 Sleep. EEG highlighted by red box.

Non-rapid eye movement sleep

5 links

Stage N2 Sleep. EEG highlighted by red box. Sleep spindles highlighted by red line.

Stage 3 Sleep. EEG highlighted by red box.

Non-rapid eye movement sleep (NREM), also known as quiescent sleep, is, collectively, sleep stages 1–3, previously known as stages 1–4.

Sleep disorder

5 links

Sign with text: Sömnförsök pågår (Sleep study in progress), room for sleep studies in NÄL hospital, Sweden.

A sleep disorder, or somnipathy, is a medical disorder of an individual's sleep patterns.

Sleep deprivation

6 links

Main health effects of sleep deprivation.

Sleep deprivation, also known as sleep insufficiency or sleeplessness, is the condition of not having adequate duration and/or quality of sleep to support decent alertness, performance, and health.