Our house has the smallest bedrooms I've ever seen. So, we've built up to accomodate sleeping (as in lofts).
This is our guest room, used to be my dd's room. Relatives can sleep on the full-size bed below, and the kids in the loft.
My son (excuse the mess) uses the space under his loft as his entertainment center. His gaming, tv, and electric bass are stored there, along with his gaming chair.