Significant overnight weight loss coupled with dark urine suggests dehydration.

“you went to bed at 200 lb you woke up the next morning at 195 it's like oh you floated five pounds did you pee last night yeah yeah three times interesting another case you woke up you went to bed at 200 lb you wake up at should have a certain amount of fluid that you're just respirating out as you're breathing throughout your nose throughout night ideally  guaranteed you're going to wake up what was your urine like oh yeah a little bit pretty dark like shocker you're dehydrated”