I don't remember this with my first (currently 19mo) but this time if I wake up early (between 5-6am usually when the dog wakes me up) I am not able to go back to sleep. And I am the QUEEN OF SLEEP and of the snooze button. Like, if I can go back to sleep for even 5 minutes I will. But for some reason since a couple days before I got my positive at 4 weeks I can NOT get back to sleep once I'm up. Currently 5 weeks and this is getting old. Mama needs to sleep!