Cherie, I would wake him after about 3 hours during the day. This will ensure your milk supply gets stimulated. He's a big boy with lots of lovely fat stores so this is probably helping him out! I woke mine after 3 hours - just until my supply was nicely established. It will also help him to subtly learn the differences between day and night. I also wake mine around 10pm for a feed before I go to bed - but that is just my thing!