DS is 23 weeks and since 7 weeks old has slept through the night. He has been going through a period of waking earlier over the last few weeks with the occasional wake through the night. He usually gets a bath between 7.30 - 8 then in bed between 8.30-9pm. He would have slept until 8am before and now wakes sometime between 5am - 7am. Since the clock change he has been getting grumpy from 6.20pm my suspicion getting tired. We have stuck to the same bath and bed times but he is waking an hour earlier between 4am and 6am. When should we bed him now?