Does he have a night light?
Also does a favourite toy help.
We have had no end of problems with Emily who has just turned 2 but she's still in the cot.
You could try 1 of 2 methods.
First one I know works wonders in the cot,not tried from bed though.
Lay them down,go out of the room,count to 10,go in lay him back down,go out,count to 10 etc.
As I said,may not work in bed as he can get out.
Secondly,this takes longer,the first time he gets out of bed tell he quietly that it's bedtime and take him by the hand and put him to bed.Kiss him goodnight and tell him you're going to bed.
After that when he gets out of bed,don't talk,but gently take his hand and put him back to bed.It will take a while,but he will used to staying in bed and not having a fuss made of him
You really need to try for 3-4 weeks and usually the first few nights are the worst.
Keep us posted