Most of us will be all too familiar with that dopey, groggy feeling of being tired after a restless night. Some social media users have taken tiredness to the extreme, however, by taking part in what they call a "no-sleep ...
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Sleep deprivation, having too little sleep, can be either chronic or acute. Long-term sleep deprivation causes death in lab animals. A chronic sleep-restricted state can cause fatigue, daytime sleepiness, clumsiness and weight gain.
Complete absence of sleep over long periods is impossible to achieve; brief microsleeps cannot be avoided.
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