Such is indicative of potential sleep apnea. See a MD pulmonology specialist. I drink 8 oz. of water 1 hour before I go to bed and 8 oz. in the morning even before I have my coffee. Sleep apnea is serious ... it can kill! As of this past year, I've just been on a hydrated 2 liter feed of O2 at might. I've also been diagnosed with COPD!