My boys were abt 3 when they slept in their own beds in their room.My younger one was daring at 3 yrs old n chose to sleep on the upper bunk bed.They do toss n turn alot at nite but noone has fallen off the bed yet:tlaugh:When do you allow your toddler to sleep all by themselve. on a mattress or a bed. I am quite worried that they will fall down when they wake up.