My 2 year old refuses to sleep!

My two year old refuses to sleep. He used to be a great sleeper. He would sleep 10-12 hours a night and still take a 2-3 hour nap each day. Since I have taken the pacifier away from him he began to not want to take naps unless rocked to sleep, which still takes about an hour to get him to sleep. He would also take about 1 1/2 hours to fall asleep at night. This has been going on for a few months now. I started potty training a little over a week ago, and now I am lucky if he sleeps for 5 or 6 hours a night. He falls asleep at around 11 or 12 at night and sometimes wakes up as early as 4am, and refuses to go back to sleep. He uses every excuse he can to continue getting out of his bed. He will say that he has to potty, even though he went potty only 5 minutes before, or he needs a drink, or he will simply just get up and play. I know he is adjusting to the changes with no longer having the pacifier and the potty training, but we are exhausted and need some advice on how to get him to sleep a little better.