Bunk beds
Of course, bunk beds are a good idea to give space in a room. Each child will have their own privacy and space for the night, and they will have enough space to play.
Triple bunk
If you need space, giving them three children is already a challenge. But there are triple bunk beds that take up the space of a single bed, and that allows space for children to play.
Three beds together
If your room is long enough, you can put three beds together, one next to the other. It is best to customize the head of each bed, so that each child has their space.
More information - Boy's room decoration style 1
Source - leroy merlin
I am interested in the 3-high bunk