Fluxuating Sleep

Darling little girl. She's now been transitioned to the crib but our sleep patterns have become erratic. For a few days, she was sleeping 5 hours (and once 6 hours) followed by waking every hour until 6am. Then, for whatever reason, she started waking every freaking hour throughout the night. Goodbye sanity. Last night, she went to bed very late (I don't know why she would sleep) and then slept 5 hours straight, then woke every hour. And now it's 10:41am and she's been asleep for 2 hours when normally she only sleeps for 40 minutes. Agh!