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Daytime Sleepiness

What is daytime sleepiness?

Daytime sleepiness is feeling sleepy during the daylight hours, when most people are awake and alert.

What causes daytime sleepiness?

Daytime sleepiness can be caused by:

  • Not having good sleep habits – For example, not having enough time to sleep at night or not having a regular sleep schedule.

  • A sleep disorder, such as:

  • Sleep apnea – People with this condition stop breathing for short periods during sleep.

  • Narcolepsy – People with this condition are very sleepy in the daytime and sometimes fall asleep suddenly during normal activities.

  • Insomnia – People with this condition have trouble falling or staying asleep.

  • Things that disturb your sleep, such as:

  • Sounds – For example, if you have a new baby, he or she might cry and wake you up at night.

  • Health conditions, such as restless legs syndrome or nighttime leg cramps.

  • Schedule changes that affect sleep – This might include working a night shift or traveling to another time zone.

  • Medicines – Certain medicines can cause daytime sleepiness.

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