A trundle bed is another space-saver because beneath its slightly elevated main bed is another one that slides in and out from the frame. Since this style of bed sits low to the floor, if a child falls out she is unlikely to hurt herself.
Beds of this type are handy for sleepovers. You can even find a bunk bed with a trundle bed that allows three children to sleep in one room. If you have a device for measuring noise, it’s going to record a high decibel level.