Where did my sweet boy go?

For the past 2 months Matt and I have been struggling with Jonah and sleep. He used to be the perfect angel! I would read him a story, turn on his music, lay him in his crib, and he would sleep from 8:00 p.m. to 7:30 a.m. the next morning. Then for his naps I would lay him down at 1:00 p.m. and he would sleep for about 2 to 3 hours.

Well, me trying to plan ahead with the baby coming I decided 2 months ago that it was time for Jonah to be moved to a toddler bed. BAD IDEA! I do the same routine with him just like I did with the crib and he REFUSES to go to sleep. He keeps getting up and out of bed and I have tried EVERYTHING I can think of to get him to stay in his bed! He will fight with me until 11:00 p.m. some nights! I WANT TO SCREAM! After all the crying and screaming this is what I go in to his room and find....

Why he can't fall asleep in his bed instead of on the floor at 11:00 p.m. at night I DON"T GET! He will then wake up at 3:00 a.m. and try to get into bed with Matt and I. We put him right back in bed and it is the same thing over and over again for about an hour! Then he decides to wake up between 5:30 and 6:00 IN THE MORNING! AAAAHHHH! HELP ME! Anyone with ideas PLEASE HELP!

The worst part about this is that because he isn't sleeping like he normally does, he is CRANKY ALL THE TIME! I'm having a baby VERY SOON and I can't do this anymore! I love him so much but he has never made me go this crazy about something before! WE ARE SO TIRED! HELP!