My 4 month-old goes down well at 9am for about 45 mins, he's then awake for 2 hours and takes another nap close to 12. But this nap lasts only 45mins when it should be closer to 2 hours from what I've read on the topic. He wakes up screaming like he's had a fright and it's impossible to settle him back to sleep. The rest of the day is off kilter, he gets overtired and I end up putting him to bed way to early for his night sleep (like 5.30pm). If I take him out in the pram at 12.00 he sleeps for about 2 hours (broken) but it's not feasible to pound the streets every day so that he can nap there. And I've read that motion sleep is not as good quality. Any tips? Thanks!