Sleeping medications should not be given to children without a doctor's prescription and supervision.
Make sure that you do not feed your children with sugar foods and juices that contain artificial colours. Some children get very hyperactive after some foods and drinks and also can get overexcited watching some programmes and playing on the computer games.
If their normal bed time is 8pm, start to get them ready at 7pm. Get them to brush their teeth, have a warm bath, a warm milk drink (if they are OK with milk). Settle them down for bed and either read them a story or allow them to read a story giving them notice when the light will be switched off in their main bedroom.
If they are not at school, allow them to run around and play in the afternoon or take them for a walk to tire them out.
Keep sweets and treats for early in the day time so it does not give them a high sugar rush before bedtime.
Sometimes kids just like to stall for time and come up with all sorts of excuses so as to go to bed as late as possible.. Be firm and say that in x amount of minutes the lights will be turned off. Don't given in to them.
Don't shout, but tell them in a low key authoritative voice, by the sound of your voice they will know that you mean business.
Best wishes.
It sounds like the kids are not getting enough exercise, if it takes them three hours to go to sleep at night. A healthy child needs a LOT of exercise. Do you live near a park or a track?
For thousands of years our children have been falling asleep without the need for pills. Giving your healthy child a pill to fall sleep is sending him the wrong message—that he needs a pill to do what should come naturally.