My little niece sleeps wonderfully throughout the night but not throughout the day. What is also interesting is that when she wakes herself up during the day it is as if she has shocked herself awake. Has anyone experienced this type of 'shock waking' before? My sister-in-law has said that, as the baby sleeps during the night for long periods she wouldn't be worried about her staying awake most of the day, but it is just that she seems to be wanting to sleep but then shocking herself out of it. My niece is only 3 months old.