You're a small man in the giant room, but you still need go to bed, the only way to get up there is parkour. Jump your way up, before your giant mom goes into the room and find out that you're not sleeping. You can play in multiplayer with a friend and there is checkpoints for more convenient gameplay. You can play catch-up and considering parkour elements, it will be more fun.
How to install maps:
Download .mcworld file below
Open file using any file manager to import it into Minecraft PE
Open Minecraft Pocket Edition and look for the map among your worlds