When there are time changes, I usually just adjust my son's sleeping time by 30 min. For example, we just moved the clock forward for an hour. So I moved my son's bedtime earlier by 30 min on the night, and then another 30 min the next night. And I woke him up at the same time according to the new adjusted time. He seems to adjust well over 2 or 3 nights. I have been doing this since he was born and he seems okay with it so far.