My 11 month old has just started nursery and is totally fine with it. She never cries when I leave and is always really happy there. But since she started, she has been waking a lot in the night and crying a lot. I don't think it's teething because her firt 4 teeth came through with not many problems. Could she be waking and thinking "What just happened today? Mummy left me all day!" and her emotions are coming out at night rather than in the day?