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Do you often feel very thirsty at night?

Intense thirst accompanied by a dry mouth upon waking is not insignificant. It may reflect dehydration linked to excess sugar in the blood . The body seeks to compensate for the loss of water caused by urine by stimulating the sensation of thirst, called polydipsia .
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Are you exhausted despite a full night’s sleep?
Chronic fatigue can be a sign of poor glucose utilization by cells . The result: a persistent lack of energy, as if your body has not really recovered , despite eight hours of sleep.
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Do you have a dry mouth when you wake up?