Dehydration can cause tiredness, if not detected, it can easily creep up on you after a good nights sleep. An insufficient fluid intake for a hour or so before bed, then no fluids for a further 8 hours whilst sleeping and maybe an insufficient fluid intake for another couple of hours, once awoken the next day; that's 10/11 hours without fluids.
Before my takedown and due to less of my small bowel to absorb fluids; I suffered from dehydration which resulted in Kindney failure and it's such a gradual process, I didn't release what was happening, I Just felt tired and was sleeping until I had no energy what so ever.
Doctors have advised, as a guide, to remain sufficiently hydrated we should produce urine at least three or four times per day, which should be of a pale straw colour.
Since my takedown, I experience fatigue and an unusual sleep pattern, which I believe is due to dehydration, I sleep through once asleep without disturbance for at least 8 hours but I often awake the next day still feeling very tired.
