Such an obvious cloche - why didn't I think of this? You can cut the sheets to suit the size of your beds. I could do this with just a few wooden stakes between the sheets of ripple roof, and it'd be perfect to protect from hail or cold!
Timber-framed home by Yoshichika Takagi has attic bedroom and translucent sunroom
A clear plastic roof may be just what you need. You can get clear corrugated roofing at your local building supply store or try something a little different. The material in this photo is inch thick honey comb plastic from Tap Plastic.
It Met creates flexible workspace for Buenos Aires ad agency