Bedtime Battles

I have no clue what to do to make these boys go to bed anymore. It seems like when I say it is time for bed they get their second wind.  No matter what I do they want to play and wrestle and hurt each other instead of laying down and going to sleep.  They take benadryl to help them sleep but that doesn't help them go to sleep.  We have tried reading for a while before bed to calm them down. We have tried them standing on time out for a while before bed.  I have no idea what else to do.  I think we are gonna start cutting out t.v. about 6 and then separate them and let them read quietly for an hour and then send them to bed one at a time.  Maybe that will work. I will try anything once.