Tent on top bunk . Source: Delightful Distractions - HOME SWEET HOME. Easy DIY using fabric or even sheets. For bottom, build in rod and use curtain hangers or tack Velcro to wood and panel for a more stationary curtain. For top bunk, hang from ceiling.
We decided on the Kura bed from IKEA but put a double bed underneath for reading bedtime stories. There isn't much headroom for adults but it's great for the kids. I was also pleasantly surprised by the bedding at IKEA. These two duvets