Great for: Kids. Just add a couple of flashlights and this cot and air bed will make a kid feel as if he's camping out. The two-inch-thick inflatable mattress, slightly longer and narrower than a standard twin, can be used alone or with the aluminum cot frame, which folds down for storage.
To buy: Coleman Overnight Spacesaver Air Bed and Cot, $60, target.com.
2 of 6Ellen Silverman
Great for: Kids. By day it’s an ottoman, a coffee table, or a spare seat that rolls about on casters; for sleepovers, it moonlights as a camp bed. The machine-washable microfiber slipcover fits snugly over the cushion-topped metal frame. The 3 1/2-inch-thick foam mattress is nine inches narrower than a twin.
To buy: Fold-Up Sleeper Ottoman (30 by 25 by 19 inches when closed), $200, plowhearth.com.
3 of 6Ellen Silverman
Great for: Friends. A daybed keeps its secret function under wraps when your family is using the guest room as office, playroom, or whatever it's called the other 364 days of the year. When it's time for a sleepover, just bring on the pillows and blankets. This striking solid-wood bed lacks the big-furniture clunk factor yet fits a standard twin mattress.
To buy: Overlapping Squares Daybed (78 by 41 1/2 by 30 inches), $459; with mattress, cover, and bolsters, $959: westelm.com.
4 of 6Ellen Silverman
Great for: Friends. This daybed, with its mahogany sides, is chic enough for the living room. An optional trundle rolls out and pops up to the daybed's height; join the twin mattresses with a king pad and have a pajama party, like the old days―or just let your pal sleep in kingly splendor.
To buy: Barcelona Daybed (36 by 77½ by 41¾ inches), $799; with trundle, $1,058 (neither price includes mattress): charlesprogers.com.
5 of 6Ellen Silverman
Great for: Your parents. The ultimate living-room workhorse, this classic says to Mom, "I am all grown-up and have inherited your practical streak." With a 5 1/2-inch-thick queen-size innerspring mattress under plush cushions, it also says, "We want you to sleep through Junior's early-morning cartoons." It's available slipcovered or upholstered, with hundreds of fabric, leather, and color options (shown in washable cotton in Sonora Cloud).
To buy: Alex III Collection Slipcovered Queen Sleeper by Mitchell Gold + Bob Williams (couch is 36 by 79 by 34 inches), starts at $2,630, mgandbw.com for stores.
6 of 6Ellen Silverman
Great for: Your mother. Don't have enough room for a full-size sofa bed? How about an oversize reading-chair bed? Upholstered in stain-resistant microfiber (in Dublin Aloe), it opens to reveal a five-inch-thick twin innerspring mattress and a locking headrest. Other colors can be custom ordered.
To buy: Unfortunately, this item is no longer available, but find similar products at crateandbarrel.com.