I was wondering if there’s a move that doubles power if the user is asleep like with Comatose it is kinda asleep but not and facade so t work on sleeping Pokemon so any help?
I don't think there is a single move that does this, Snore can only be used when asleep but it doesn't have double power. However, a Pokemon with the Guts ability get a 50% increase in physical attack when succumbed to a major status ailment, including sleep.
Have a Pokemon with Guts use Sleep Talk and hope they pick a physical move out of their set. Pretty sure this is the only way for you to achieve your desired effect.