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Richmond, VA
A 21-year-old female asked:

I always drink at least 32 oz. of water before i go to bed but then wake up feeling dehydrated with my urine being a yellow color. why is this?

2 doctor answers3 doctors weighed in
Dr. Donald Nino
Family Medicine 39 years experience
Fluid intake: 32 ozs is not that much fluid for a 24 hour period. Would have to count all fluids per entire day. If your urine is still dark, you could still behind on your fluid intake. Consult with your doctor to check for any problems.
Dr. William Harris
Family Medicine 34 years experience
Normal: There are a few issues at play. When you sleep, you are not drinking water and you may be sweating just a little under the covers. We call this insensate loss - you don't actually feel the sweat you are losing. Everybody wakes up with dark urine. The trick is to drink plenty of water through the day such that your urine at the end of the day is clear. Then, you start the cycle over...

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Last updated Dec 16, 2014

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