My nearly two year old has never been the best napper but over the last few weeks she's gone from having one quite good nap a day ( usually around 1 and a half hours) to barely sleeping for 20-30 mins . She's happy to go for a nap and asks to go to bed but just doesn't stay asleep! She cries and is tired when she gets up after her nap . She is also very tired by bedtime and this makes her really grumpy! She sleeps 1900-0530 ( if we are lucky , sometimes it's more like 5am) and no amount of changing nap times helps with early waking . I just get worried as everyone else I know with similar aged children have naps that last 2-3 hours and who sleep 7-7! Will this lack of sleep hurt her? Thanks in advance!