Excessive daytime sleepiness is defined as difficulty staying awake or alert, or an increased desire to sleep during the day. The feelings of sleepiness may be stronger when you are sedentary3, such as while driving or sitting at work.
are sleep deprivation and disorders like sleep apnea and insomnia. Depression and other psychiatric problems, certain medications, and medical conditions affecting the brain and body can cause daytime drowsiness as well.
Why do I keep nodding off during the day?
Not getting enough sleep -- sometimes by choice -- is the most common cause of excessive sleepiness. Working at night and sleeping during the day is another. Other causes include drug, alcohol, or cigarette use, lack of physical activity, obesity, and the use of certain medications.
What does it mean when you doze off?
: to fall asleep especially for a short period of time A few students dozed off during the movie.
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