Q:  How does drinking water after waking up from sleep affect blood sugar levels? 

A: It doesn t. Unless the patient is severely dehydrated. As we wake, our bodies release
numerous hormones - a few of which will trigger the release of glucose into the
bloodstream, to  prime the pump  by fueling your system so you can hunt down, capture and prepare your breakfast; or nowadays, stumble to the  fridge and coffee
machine. This is called the Dawn Phenomenon, and it happens to ALL vertebrate life
forms on earth.

BUT  in DM (Diabetes Mellitus) patients, there is either a lack of the normal insulin
response, or the body s cells  resist  insulin s action - they simply respond too slowly
and incompletely, and as a result (of both circumstances), BG (Blood Glucose - the
correct term for  blood sugar ) levels rise. IF BG rises to or above the renal threshold for
glucose (180 mg/dl, or 10.0 mmol/L), the kidneys begin  spilling  the glucose into the
urinary tract to get rid of it - because at that level, they can no longer recover it as they
normally do.

THAT dehydrates the patient - making them thirsty. For this reason, DM patients will be
thirsty upon waking when BG is higher than the renal threshold. But drinking water does
little to lower BG levels; this process stops when BG drops below the renal threshold,
and that is still way above the top end of normal BG for adult humans (140 mg/dl or
7.77 mmol/L). And that top end is rare; most of the time, for about an hour after each
meal, BG rises to no more than 120 mg/dl (6.67 mmol/L), then drops back to the basal
level (90 to 100 mg/dl, or 5.00 to 5.55 mmol/L).

SO  IF BG is extremely high, the patient will be thirsty - but drinking water does not
lower BG by much if at all, UNLESS they are severely dehydrated - and then, the
dehydration would be the life-threatening issue. Under normal circumstances, drinking
water has NO effect on BG levels; your circulatory system is not a balloon, to which you
can add water by simply drinking it. Your fluid levels are tightly controlled by a complex
hormonal system - beginning with the fluid regulatory hormone AVP, or Arginine Vasopressin Peptide, aka ADH (Anti-Diuretic Hormone).

Full story: https://www.quora.com/How-does-drinking-water-after-waking-up-from-sleep-affect-
blood-sugar-levels

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