My baby is 11weeks old. She currently goes to bed between 730/8 and can sleep until about 530.  The last few nights she been waking up at 4am. She doesn't cry, just tosses around and makes a lot of noises and wiggles around. (They don't sound like she's displeased).    Anybody else experience this?  Should I just wait it out and let her move around until she goes back to sleep? Or get up and feed her?