Feeding

My 1 week old was originally eating every 2 hours, 3/4 when he gets his deep sleep. It quickly turned into everything other hour or two for about a day or two. Now he’s cluster feeding. Typically eating about 10-20 mins on and off for about 2/3 hours. My question is, he last ate at about 9:45. Should I wake him now to feed? Or let him wake up on his own and then feed him? He was 5lbs 12oz at birth, yesterday at his appointment he was 5lbs 15oz. I strictly breastfeed.