sleep time troubles!! help??

Pamela

My son just turned three years old, and both nap time and bed time, (even when he's so tired he's falling asleep standing up) he doesn't want to go to bed. it takes hours for him to fall asleep, every time!! I've tried everything I could think of and nothing works!! I also have a one year old and I'm 22 weeks pregnant with my 3rd BOY and let's just say I'm exhausted:( ANY suggestions???