My daughter wasn’t always the best sleeper but overall would sleep pretty much through the nigh. For the last few weeks though, she wakes up like an hour after she falls asleep and sits up in her crib. She will sit like that for literally 20 mins until my husband or I go and pat her back to sleep. Then she wakes up several more times just like that throughout the night. What’s going on?!? She never did anything like that before. Is there a 24 month sleep regression? When will it end?