Sadiebean
It sounds like the time change may have threw him off a bit...hopefully that will go back to normal. With a 6:-6:40 bedtime, I too wouldn't go earlier..if anything, later like you tried.
You are BF right? If so, I think I have read where some babies still wake at night for a feed, but not sure if they are still having the dreamfeed as well? Does he wake at the same time every night? If so...probably a habit...?? I wouldn't worry about making the df later. You actually want to hopefully cut this out at around 7 months
You could try the wake to sleep for the 5AM waking. Since he is waking happy though, I would let him play until he was really fussing to feed (hopefully 6-6:30)....eventually it should work itself out (eventually meaning as much as a few weeks :wink:
) By continuing to feed him at 5:30, he may be waking just for the feed. Your days will probably be a little wacky, throwing EASY off a bit but it's ok to tweak it. As long as you don't feed to sleep, you are on the right track. EASY is mainly to prevent feeding to sleep/overfeeding and helps you read their cues better
HTH