Making the most of a short nap
People who are sleep deprived feel groggy during the day and may fall asleep when they least want to, perhaps at their desks or, worse, behind the steering wheel. Poor sleep at night may be caused by simply not devoting enough time to sleep or by medical problems that disrupt sleep, such as restless legs syndrome and obstructive sleep apnea. And in some cases, daytime sleepiness can result directly from medical problems such as depression or an underactive thyroid.
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