Hypersomnia or daytime sleepiness is an unwitting activity which causes an irresistible urge to lie down in order to rest or sleep.
It mostly affects unemployed or young people and is marked by periods of excessive sleepiness for two to four weeks coupled with a ravenous appetite and psychotic like behaviour during waking hours.
It is also an early signal of depression, in some cases.
Some famous day-time nappers include artist Leonardo da Vinci, Winston Churchill, Albert Einstein and many more. Waterloo adversaries Napoleon Bonaparte and the Duke of Wellington were both accustomed to catnaps, even on the battlefield.
Sleeptips.org
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