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A 44-year-old member asked:

why do i get headaches when i get woken up?

1 doctor answer1 doctor weighed in
Dr. Michael Rothman
Internal Medicine 35 years experience
PNS problem?: Sleep increases parasympathetic nervous system (pns) activity. Pns also can relax blood vessels and hence increase blood flow to your brain. When you are awakened this could manifest as a headache.

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Last updated Feb 11, 2013
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