For the last few weeks my 21 month old DD has taken about 90 mins to go to sleep from when I put her down. She's as good as gold about going to bed (cot bed) by 7pm but then starts, chatting, singing, thumping, sometimes reading for about an hour and a half. She'll call out to me when she's chucked her teddy/dummy out and when I stick my head in and tell her it's time to go to sleep she lies down and closes her eyes but begins all the crazy business soon after. Should I worry or do anything about this? She's been waking slightly earlier in the morning (from 5am but I won't get her up till 5.45am at the earliest) since she's started sleeping later. She naps for about 2 hours in the day, but a shorter/earlier nap seems to make no difference to the night time antics.