Where did the sleep go???

aveeh

DD is 11 weeks and has been a great sleeper so far.  She usually goes down around 8, wakes up sometime between 2-3 to eat, and then wakes up for good around 7 or so.  But the last 2 nights have been terrible!  Last night she went down at 7:30 and was up at 9:30, 1:00, 3:30, 6:00, and stayed awake at 8.  What happened? Its been this way for 2 nights and I don't know what prompted the change.

Has this happened to anyone else?  Did LO just go back to their regular routine after a few nights?

Its so cruel to have good sleep and then get it taken away!