6 week old sleeping too much?

Mystery

My 6 week old sometimes wants to sleep for 5 hours during the day. Should I wake him up to eat? He was born at 34 weeks at 6 lbs 2 oz and was 8 lbs 7 oz at his appointment on the 28th. I was waking him up every 3 hours for the first few weeks until he got above his birth weight but then kinda decided to let him do his own thing. He was still waking up every 3-4 hours. First time mom and freaking about everything.