My LO does this too, she's 8 wks old. Up until a week ago we weren't doing the DF bc i couldn't get her to take it but i've been tweaking her early evening feeds and she's taking some now, not alot but it's a start. Before we started the DF she'd go to bed about 730/8 and sleep till about 2/3am but still awake for an hour or two at that time. If I just left her lay quietly on her bedroom floor, lights dim, no stimulation she'd go right back to sleep after her hour but if i tried to fight with her to go back to sleep it would be a 2-3 hour fight and she'd get overtired and miserable....Once I started the DF i did one night of wake-to-sleep and she slept till 430 but again was still awake for 2 hours. On day two we hit a growth spurt and that's where we're at, I'm hoping only another day or two and we should be able to start working on our schedule again.