In japan it’s very common for one large room to have sliding panels with just enough room behind for a bed. That area is then air conditioned for sleeping. It’s effectively what you’re talking about here: a small AC unit so it can be eco friendly, and just enough to cool the bed for sleeping. I think it’s a fine idea. I don’t think you need to overdo it for sound proofing, for example. Just a cool place to sleep and if it is too loud, earplugs!
I like the idea that Indah wants to make it soundproof. I wear ear plugs more often than not. They don't keep out loud sounds, only muffle them.