You probably wouldn't need box springs if you did something like this. They seem like they'd be comfortable enough for short term visits.

Several things you can do with 2 twins. Also, yes, you can get the bolsters at JC Pennys or any fabric store that sells foam can cut it.

Options:

Make a large parsons type table for the one to slip 1/2 way under and set them on an "L".

Set them in built in bookcases so only 1/2 the bed protrudes with a cushioned backer for the "sofa area".

Instead of twin beds get thick mattressed click clacks.

Get the Ikea table and add a back support

Thank you, thank you! Now I can visualize the solution! Since I already own two fairly new box springs and mattresses, I want to use those. I had to get my head past keeping the bed frames. Great ideas!

Although I like the wood base, you can also upholster the box springs and add feet.

Bed Bath and Beyond and amazon sell the daybed wedge pillows, and Pottery Barn and Touch of Class have some nice daybed covers including wedge covers. I wouldn't use regular bedspreads on them. I think your bookcase idea is good, maybe have the bookcases 90 degrees to the wall and use at each end might be an inexpensive built in look. Depends on how wide your room is. I think it will be a nice addition to your studio.
Sort of like this, except 2 beds long? Just a thought.
http://www.wayfair.com/Hillsdale-Furniture-Cody-Daybed-with-Trundle-1604SET4FT-HF5534.html

@gmh123 - interested to see your studio!

It might also be neat if you set them across from each other like conversation couches. If you drop the mattresses into antique frames similar to something like this, that would create a great gathering space for meetings or pow-wows, provide tons of extra seating, and then also when your guests come, the frames look enough like bed frames that it would make the beds feel home-y and not office-y. Local flea markets or antique shops would be a good place to start. Hope this helps! Happy decorating!

Design It Yourself Decor | loomdecor.com | blair@loomdecor.com

Unfortunately old day beds rarely fit a twin mattress.

You have all given me such great ideas! Thank you! I am now envisioning some new possibilities I had not thought of. I have a closing date in 2 weeks, and the studio space will get set up first while the main floor gets some painting, new flooring, and a sunroom added on, so I might be sleeping in this spot I asked about myself temporarily. My art studio is going to be in a wonderful finished walk out basement with big windows and north light (ideal light for painters). I will share photos here for sure, have gotten so many great ideas from fellow Houzzers!

I like the idea of adding legs and making them moveable Mike Link, so they can be separate or together like yours, depending on who is sleeping in them. Rocketjcat, thanks for letting me know about resources for bolsters and bedding. Loom Decor, I do want a conversation area too....this might meet that need as well. If I put locking wheels under the legs, and create a corner, that would work! Oh my....this will be great!

Sounds like you are going to have some fun with this!

Simple foam pads are relatively inexpensive, fortunately, and you can find them at good upholstery and fabric stores, or online; simply give them your dimensions, and they'll cut to fit. Make sure you get right density foam, and when it comes time to upholster, adding a heavy old down quilt or duvet to the top, under the fabric, makes it the most luxurious sleeping spot in the house!

I was searching Houzz for some examples of daybeds set up as Loom Decor suggests, using them more as open sofas, and came across a couple. OK, more than a couple!

There are some set up with canopies, although they tend to get a bit twee-little-girl's-room-esque:
This one is a nice set-up against a wall:
Ooh-la-la!
And some more:

These photos show variations on two concepts. The beds end to end but separated by by something which in your case could be a bookcase, a file cabinet or two tall dividers. The other is a corner arrangement. https://www.houzz.com/photos/1960s-malibu-inspired-new-construction-transitional-kids-austin-phvw-vp~2082108

OMG....file cabinets would work and I have three 4-drawer ones...one between, one on each end....that idea is brilliant! Thank you!

One more: This one shows how adding throw pillows make a nice settee :)

I suddenly see a desk possibility making sense too, yet taking up very little space from my painting area. Fortunately, I have a huge room for this. I started with no possibilities and now I have options. I like this one too. Thank you hanna!

You're welcome! :)

Has anyone suggested this kind of corner bed idea? I like the idea of putting the bed on legs or on a lift system if it is on a frame. Then you can skirt it and have room underneath for rolling lidded storage.

Standard Twin mattresses are 39''x 75'' (inches). I am an average sized person and my favorite chair depth front to back is about 22".
That would mean the back would need to be about 17" from the front of the mattress. That is pretty thick. Taller people could be comfortable on a greater depth of course.

I feel the most important things are...
1.) back comfort...if the back isn't tall enough, it will not be used as a back rest and people will have to just perch on the edge.
and 2.) the depth of the seating area. If it is too deep people will have their legs out straight in front of them (like kids). This is especially uncomfortable for short people.
The only real way to remedy these situations is to have the back especially thick and tall.

Yes, being short, I thought about that too, but good to consider.