Being a bed-lover (or at least someone who really enjoys what can be done in a bed) I thought this fact was interesting.
In the 1500’s there was nothing to stop things from falling into the house. The roofs were just thick straw piled high, with no wood underneath. This posed a real problem in the bedroom where bugs and other droppings could mess up your nice clean bed. Hence, a bed with big posts and a sheet hung over the top afforded some protection. That’s how canopy beds came into existence.