So happy to have this group! I lurked in the decluttering forum, but never quite fit in!
I have 2 boys- a 4 year old in a toddler bed and a 20 month old in a crib who share a 10x10 room that doubles as their main play space in the home. The little one is ready to move out of the crib, and the older one needs a bit more room to wiggle in, and in thinking of possible sleep solutions, my initial thought was to just get rid of the beds and put their mattresses on the floor side by side, or give them a full size mattress to share. Surprisingly, dh was totally on board, though he's not really minimalist and insists on doing things "properly" (meaning, don't question the standard). They have no other furniture in the room, other than their train table and toys.
I know plenty of people share beds and just do mattresses on the floor, but it is weird at all to ask our kids to do that, if we as their parents won't? It would certainly save space and I hate the under-the-bed black hole, and they loved sharing a bed while on vacation last week.