my 15 month old goes to bed and sleeps well every night (yes I'm lucky!!) He goes at about 7pm and sleeps until 6-6.15 am. However for the last few eeks he has woken at 4.30 ish crying and I have put his dummy in. He then goes back until 5.45 ish and then wakes up sobbing. He has never done this before he usually wakes in a good mood and shouts hiya or daddy! Any ideas? He has had nbo jabs or accidents or anything else I can think of. There has been no change in when the heating comes on or anything like that - Help!!