My LO is nearly 7wks old and in the last 3 days he has been sleeping all the time in the day it seems, prior to this he was usually awake, give or take an hours napping here and there, he is awake for the odd random hours, when sometimes he is grizzly but he's also still smiley and cooing at other times, so I just wondered if I should feel concerned that he has changed his sleep patterns all of a sudden.