What do my kids have against sleeping?

[Bookworm]

Thanks for the ideas ladies! I cant remember exactly what is was now, but before she fixated on monsters, she used to get upset because something else was in her room so my husband and I have both taught her how to get rid of them and the monsters (we got her to roar at them). We've both "kicked" out all the monsters several times too. I will try the monster spray to see if that works. We've also talked about real vs pretend too as well as friendly monsters too. Funny thing is, she will ask us to tell her a monster story at bedtime, which we refuse to do for obvious reasons.
I know sometimes she uses it as a stall tactic, other times she does seem like she is afraid of them.
Toregone- My daughter is 3.5 and my son will be 2 in February.