My 6 yr old has only recently at bedtime started getting upset about going to sleep. She says she is having bad thoughts of daddy leaving the house or not being in the house while she’s in bed. There is no obvious reason for this. I’m separated n have 50 % custody. I have talked this thru with her but she says it’s simply just bad thoughts about being left in the house alone despite the fact it’s never happened. Anybody else come across this? Strategies ? Tried all the reassurances but nothing working