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Drowsiness refers to feeling abnormally sleepy during the day. People who are drowsy may fall asleep in inappropriate situations or at inappropriate times.


Excessive daytime sleepiness (without a known cause) may be a sign of a sleep disorder.

Depression, anxiety, stress, and boredom can all contribute to excessive sleepiness. But these conditions more often cause fatigue and apathy.

Causes of Drowsiness

Drowsiness may be due to the following:

  • Long-term (chronic) pain
  • Diabetes
  • Having to work long hours or different shifts (nights, weekends)
  • Long-term insomnia and other problems falling or staying asleep
  • Changes in blood sodium levels (hyponatremia /hypernatremia)
  • Medicines (tranquilizers, sleeping pills, antihistamines)
  • Not sleeping long enough
  • Sleep disorders (such as sleep apnea syndrome and narcolepsy)
  • Too much calcium in your blood (hypercalcemia)
  • Underactive thyroid (hypothyroidism)

Home Care

You can relieve drowsiness by treating the cause of the problem. First, determine whether your drowsiness is due to depression, anxiety, boredom or stress. If you are not sure, talk with your health care provider.

For drowsiness due to medicines, talk to your provider about switching or stopping your medicines. Never stop taking or change your medicine without first talking to your provider.

What to Expect at Your Office Visit

The doctor will examine you to determine the cause of your drowsiness and ask about your sleep patterns and health. Questions may include:

  • How well do you sleep?
  • How much do you sleep?
  • Do you snore?
  • Do you fall asleep during the day when do not plan to nap (such as when watching TV or reading)? If so, do you awake feeling refreshed? How often does this happen?
  • Are you depressed, anxious, stressed or bored?
  • What medicines do you take?
  • What have you done to try to relieve the drowsiness? How well did it work?
  • What other symptoms do you have?

Tests that may be done include:

Treatment depends on the cause of your drowsiness.


Chokroverty S, Avidan AY. Sleep and its disorders. In: Daroff RB, Fenichel GM, Jankovic J, Mazziotta JC, eds. Bradley's Neurology in Clinical Practice. 6th ed. Philadelphia, PA: Elsevier Saunders; 2012:chap 68.

Kryger MH, Rosenberg R, Lawrence M. Hypersomnolence. In: Kryger MH, Rosenberg R, Martin L, Kirsch D, eds. Kryger's Sleep Medicine Review. 2nd ed. Philadelphia, PA: Elsevier; 2015:section 4, 95-116.

Review Date: 3/4/2015
Reviewed By: Timothy Rogge, MD, Medical Director, Family Medical Psychiatry Center, Kirkland, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
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