I'm not sure I understand - is he home part of the day with dad and part of the day with you? If he's eating and sleeping/napping fine when dad's around, but not with you, that sounds fine. Kids often behave different when mom's around. I know my son will sometimes be sweet and cooperative with his dad or babysitter, but when I'm around he gets all whiny and clingy. I think those are just the days that something is bothering him so he cries about it to the person who he knows will help him feel better (me). I hear this is very normal - kids need someone who they can let it all out to, and it's actually a compliment that he can turn to you!
And if he's just not eating or sleeping much at all... call your doctor. They can probably help you figure out if this is a medical issue or just some passing phase. Sorry, I'm not sure how to help with this since I don't know the whole situation (and I'm not the best medical expert).
at 9:22 AM on Aug. 3, 2010