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Excessive daytime sleepiness (EDS) is characterized by persistent sleepiness and often a general lack of energy, even during the day after apparently adequate or even prolonged nighttime sleep.
Blocking out light with a sleep mask may aid sleep. Dim or dark surroundings with a peaceful, quiet sound level are conducive to sleep. [1] Retiring to a bedroom, drawing the curtains to block out daylight and closing the door are common methods of achieving this.
Sleeping Girl, Domenico Fetti, c. 1615 . Sleep is a state of reduced mental and physical activity in which consciousness is altered and certain sensory activity is inhibited. . During sleep, there is a marked decrease in muscle activity and interactions with the surrounding environm
The first book on sleep [citation needed] was published in 1830 by Robert MacNish; it described sleeplessness, nightmares, sleepwalking and sleep-talking. Narcolepsy, hypnogogic hallucination, wakefulness and somnolence were mentioned by other authors of the nineteenth century.
A sleep disorder, or somnipathy, is a medical disorder of an individual's sleep patterns, in some cases affecting physical, mental, social and emotional functioning. [1] ...
Sleep deprivation, also known as sleep insufficiency [2] or sleeplessness, is the condition of not having adequate duration and/or quality of sleep to support decent alertness, performance, and health.
Hypersomnia is a neurological disorder of excessive time spent sleeping or excessive sleepiness.It can have many possible causes (such as seasonal affective disorder) and can cause distress and problems with functioning. [1]
Sample hypnogram showing one sleep cycle (the first of the night) from NREM through REM. The sleep cycle is an oscillation between the slow-wave and REM (paradoxical) phases of sleep.