Why do I always feel dehydrated when i wake up?

Question

I do workout almost everyday

Answer 1

Because you slept for 6 or 8 or 10 hours without drinking any water, yet your breath exhaled large amounts of moisture. And, let us not forget your body moved a large quantity of water into your bladder.

If this bothers you, drink more water before going to bed, you will have to get up in the night for the bathroom, but you won't be so dehydrated.

Answer 2

The reason you always feel dehydrated when you wake up is because you are peeing in your sleep until all of your liquids are gone.