My four month old daughter has never really slept for long periods during the day...usually around 45 minutes at a time (3 times a day). Then her naps reduced to 30 minutes and now, for the last three days, she has only been napping for about 20 minutes. No matter what i try i can't get her back to sleep. She's not really grizzly during the day either (she does get very tired later on though). My question is, should i try to do something about this or is it ok to leave her to it. I am just a bit worried that she's not getting enough sleep.