Need some Child bed time advise.  

Have you tried reading bedtime stories to them? Soft music in the background. This works for my grandson sometimes. It can be calming.

Hello Have you tried using a reward scheme for good behaviour? As you already have one child that goes to bed without any problem it might help. If you make each a reward chart with slices of pie type shapes, if they go to bed on time and go to sleep they get a slice of the pie. When the pie is full they get a treat such as a meal out, trip to the park , whatever you would like to do. If they earn a 'slice' but are naughty the next night, that slice gets taken away. As you have one child that sleeps ok you could give them a slice for that or for any good behaviour. It tends to work better than telling them off as it encourages them to behave and most kids are competitive to a point so they will want to earn a slice rather than being told what to do and when to do it and play up.

I've had to start the bedtime process a few hours before bedtime rolls around. Like two hours before bed need to get pj's on, then another 1/2 hour start turning down the lights. Smaller children over sensatize and found that if I slow the house down for them and create a quiet atmosphere then they can bring themselves down easier. I make sure video games are up and any activity they do would be like puzzles or even play dough because it's a calming excersize.

Sometimes maybe put in a movie real quiet and let them sit in a rocking chair with their favorite blanket or stuff animal so they get the comfort feeling.

There isn't anything wrong with snuggling on the couch and if they start a pattern for bedtime they will come to like the quiet time and that time with you sitting with them.

I know it is harder to get things done around the house but setting a pattern for them is the key and it can be a reward too. I've even gave them choices do you want a movie before bed or a bed time story and they accpet it.

Whatever you try it's going to take time. These things can take weeks before you get it down, but the main key is the more quiet that surrounds them the calmer and more relaxed they get so they can shut down their bodies to go to bed.