Mamagoose, the fold up bed which becomes a dresser is similar to the ones we saw in Ireland in the castle and museum near Shannon. It is like the shaker pegs up high that they would hang chairs from, or even small chests hung on the wall from the "chair rail" and the wainscoting rail which was even higher up the wall. The shakers did not waste an inch of space. And it was flexible for use in different ways. I was thinking of the 4 captain's chairs (Windsor wooden) that my DH wants to keep, but which have no place in the house. I'm planning a high wooden board with good pegs spread on it, in my Teahouse, up high above the cement blocks where the wood framing for the end gables and the roofline begins. I'll hang those four chairs up there to preserve them. Also, if you think about it, a huge table can host a mattress. My former neighbor had a raised captain's bed built with draw curtains and a huge assortment of drawers beneath. Her grandson now has her house, she lives with his parents. Her home thus is staying in the family. The house was a small post WWII construction that my friend bought for her retirement. But it is back to serving a younger generation.

Is this the type of window seat you have now? We had a long dormer in our Virginia house, and we wanted to do this type of bed, but we ended up selling and moving before we could do a project like this. Link below gets you thinking outside the box. There are even ottomans that hold a bed. There are metal frames you can purchase then fold up, store under seat. Think of other ways you can accomplish this task other than the one you are thinking of. This might free your mind to solve your design dilemma! Here is a link that might be useful: list of single bed solutions

Azzalea, I did that with my DD's bed many, many years ago as I got tired of their stuff, from toys to clothes, hiding under there. That was over 30 years ago. Under ours is some bins with my summer blouses and shorts, a box with some old pictures and on DH's side he has a couple stacks of old 'motor manuals' that he used when working on vehicles. I need to get those out and to my shop and sell them, if I can sneak them out, he hates to give up anything even if he hasn't used it for years. In the guest room, I did have a underbed shoe storage bad that I put extra yarn in, it's now in a storage shed. There's a bag with wrapping paper under there now. I have to leave room under both as when it storms, the first place our dog heads to is under one of the beds. Helps keep the dust bunnies under control. lol

I have a low profile bed too which is faux leather upholstered. And every 2 weeks I lifted the mattress and juggled to clean the dust bunnies with my vacuum cleaner. I searched for products I could use to fix this problem. A few months ago I came across this wonderful product. And now it's dust free under by bed for the last few months. Here is a link https://munirazk51.wixsite.com/thisnthat/post/no-more-dust-bunnies It is very easy to install and not expensive. It gets the job done. It has a lot of other useful applications. I have used it on front door, room doors, closet doors, under sofa. I see so much difference in the dust in my house. I hope it helps.