Yes children are full of energy and they absorb a lot of energy from everything around them. It needs to be channelised as well as disciplined. Channelisation is through sports, studies, creative hobbies, more and diverse the better.
Disciplining is by having a fixed time for bed. At that time, the lights are switched off regardless and even if the child is trying to be awake, the parents should get into bed as if sleeping. It is a question of doing something regularly at a fixed time. After a while it gets into the child’s system.
Affectionately,
Alok Da