Health A-Z

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Harvard Medical School

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Symptoms

Symptoms of insomnia can include:

  • Difficulty falling asleep

  • Waking up periodically during the night

  • Waking up in the early morning, but not feeling rested

  • Feeling tired and irritable during the day

  • Having trouble concentrating

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From Health A-Z, Harvard Health Publications. Copyright 2007 by the President and Fellows of Harvard College. All rights reserved. Written permission is required to reproduce, in any manner, in whole or in part, the material contained herein. To make a reprint request, contact Harvard Health Publications. Used with permission of StayWell.

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