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    Sleepiness - during the day; Hypersomnia; Somnolence

    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 moreoften cause fatigue and apathy.


    Drowsiness may be due to the following:

    • Chronic pain
    • Diabetes
    • Having to work long hours or different shifts (nights, weekends)
    • Changes in blood sodium levels (hyponatremia /hypernatremia)
    • Medicines (tranquilizers, sleeping pills, antihistamines)
    • Not sleeping for 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 yourdrowsiness 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 health care provider about switching or stopping your medicines. Never stop taking or change your medicine without first talking to your health care 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:

    • Blood tests (such as a CBC and blood differential, blood sugar level, electrolytes, and thyroid hormone levels)
    • CT scan of the head
    • Electroencephalogram EEG
    • Sleep studies
    • Urine tests (such as a urinalysis)

    Treatment depends on the cause of your drowsiness.


    Griggs RC, Jozefowicz RF, Aminoff MJ. Approach to the patient with neurologic disease. In: Goldman L, Schafer AI, eds. Goldman’s Cecil Medicine. 24th ed. Philadelphia, Pa.: Elsevier Saunders; 2011:chap 403.

    Mahowald MW. Disorders of sleep. In: Goldman L, Schafer AI, eds. Goldman’s Cecil Medicine. 24th ed. Philadelphia, Pa.: Elsevier Saunders; 2011:chap 412.



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                Review Date: 4/21/2013

                Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, Bethanne Black, Stephanie Slon, and Nissi Wang.

                The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

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                St. Luke's Hospital - 232 South Woods Mill Road - Chesterfield, MO 63017 Main Number: 314-434-1500 Emergency Dept: 314-205-6990 Patient Billing: 888-924-9200
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