Lilias- have you tried getting a CD player and playing calming ocean music, baby soothing music...That might relax him and put him to sleep

this might sound abit rude but i dont mean it like that at all, how hard on him are you when you put him to bed???

i did a course which was called 'Triple P' course its all about positive parenting and it says in there for bedtime if they get out of bed to stand them in the corner for (he is 3) for 3 mins and then back to bed, if he gets up again then its the corner again, VERY repetitive but thats what they suggest after awhile of doing this every night they will get use to it, keep in mind it could take upto 20 times or so a night, i understand it might be hard with DS2 as well

With my DS1 i put him to bed, if he comes out i put him back to bed and i do this repeatedly...I dont sit with them or anything Lately he has been asking for a lamp on in his room so i let him have that and after a little bit he will fall to sleep

these are just thoughts, if the yelling out continues i would just ignore it (another idea from the 'triple p' course