Dd has usually been a reasonably late sleeper, usually waking about 7.30 am. Over the last week she is now getting up at 6.00 am. Thought this might be due to lighter mornings but blackout curtains have made no difference. Since I'm getting up in the night with a new baby I could do with some tips to get her to sleep later (she's quite whingy when she wakes so can't just leave her). Anyone had a similar experience and discovered the reason for it?