I find the kids really feed of of my energy...so if I am feeling tried and crummy, well that is the day they all start misbehaving. WHen I am in an upbeat and energetic mood, they are too It's scary the effect we can have on the whole group! So the fact that you are tired may be just it...you are tired and so small things aggrivate you and you don't have energy to do fun and silly things with them..it spirals downhill from there. If you can force yourself to put on some silly music and dance around or do something enjoyable, it might help you feel better and in turn they will feel happier. Good luck!