Muscle tissue breakdown during sleep?

[TheNegation]

i "THINK" it can sometimes convert the muscle tissue to fat.

That's not possible. Muscle which is comprised of Amino Acids can't magically turn into Fats which are comprised of Triglycerides.

And yes sleep is a catabolic (muscle wasting) period. Eat some slow digesting protein like Casein, Cottage Cheese or a glass of milk.