My daughter is 10 weeks and up until recently has been a terrible sleeper. She's breastfed and has finally started doing longer a longer stretch at night (some nights not all).
Last night she went down at 11:30 after fighting it and cluster feeding for hours 
but then had a really good stretch and woke at 4. I then finally put her back down at 5:30 but within half an hour she starts squirming.
She moans me tosses and cries out and eventually wakes herself back up. He doesn't do this during the first bit of sleep (wether it's 2 hours or 4) but whatever time she wakes up after that initial sleep she squirms!
She does it a little in the evening but in the night and early morning it's really bad. She seems so uncomfortable and of course I end up not sleeping as she is next to my bed. So I'm basically getting between 2-4 hours sleep a night.
She just doesn't go down well after that first bit f sleep :( I usually end up giving her to DH who either holds her or gives a bottle so I can catch another couple of hours.
Any advice?