My baby is a serious catnapper! He is nearly 4 months and will not sleep for more than half an hour on the dot, which means he is having 4-5 half hour naps a day and gets grumpier and grumpier as the day goes on, he cries all the time because he is so tired but nothing I do can get him back to sleep after that time and I just exhaust myself trying! It doesn't matter if it's dark, light, if he settles himself, if I'm holding him, if he's in the pushchair, in the car, however short or long I keep him awake, it's still half an hour! He sleeps through the night which is great and I know I should count myself lucky but I can't do anything in the day because he's either only asleep for 30 minutes or he's crying! Please tell me it's just a stage or that there's something that worked for you!