I have a two year old son who up until recently was very good about going to bed at about 8 or 9. For about the last week (since he spent a night with his father) he will not fall asleep before midnight. I have tried getting him up early and not letting him take a nap. I have tried give him a bath before bed. I dont know what else to do. If anyone has any ideas on anything I could try it would be appreciated.