My nearly 3 month old sleeps well at night (wakes for one feed) but during the day, she will only nap for one 45 minute sleep cycle at a time. I keep her wake window max. 1.5 hours and she usually falls asleep pretty easily but like clockwork she will wake in 45 mins. Just wondering how normal this is? She used to do at least one longer 1.5-2 hour stretch in the afternoon.