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Murphy Beds: 9 Hide-Away Sleepers

This free-standing Murphy Bed unit provides seating, room division, and last but not least, an extra bed! The seat of the sofa lifts up to reveal storage for cushions and bedding, while the bed swings down on a hinge without displacing items on display.

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.