I would make this a pop-up trundle under the window seat. Perfect for a guest room you want to use for other options when there aren't any guests.
Bedroom Bonus Room Design, Pictures, Remodel, Decor and Ideas
Small Living Room Inspiration
Bonus Room Bedroom Like the idea with different colors and textures!
Bonus Room Design - if our attic ceilings were taller I'd do something like this if we finished off the space.
This bonus room screams sleepovers!!! :)
guest room over the garage? yes....
Upstairs Loft Area Made into a Game Room < Garden Ideas Throughout this Woodsy Cottage at Camp Callaway - Southern Living
If you have extra space in a room, consider adding a set of barn doors and turning the area into a useful nook like an office or nursery.
bunk room with eight beds