Postmeal tingles: The sleepiness is a natural response to digestion. Your blood flow increases to your belly and decreases to some extent to the rest of your body causing the sleepiness. For the same reason you may experience lips tingle because blood is being directed to gut for digestion. It may also be a sign that you are lacking calcium, magnesium and/or sodium. If it gets worse please see your doctor.
Answered 10/4/2016
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