Difficult to know: Could be related to your circadian rhythm and sleep habits. For tips on good sleep hygiene, see below. If you have a medical condition such as sleep apnea, rhinitis, restless leg syndrome etc; then further discussion with a physician can help with regard to recommendations for testing or a plan. http://www.mayoclinic.org/healthy-living/adult-health/in-depth/sleep/art-20048379
Answered 3/20/2015
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