Sleep is an ongoing, naturally occurring state of mind and body characterized by relatively low activity, altered consciousness, and reduced interactions with the surrounding environment. Most voluntary muscles are inactive, and sensory activities are inhibited. The body’s functions become more specialized during sleep. These physiological changes allow the body to relax and repair itself after […]

The bed of medieval Europe was not particularly luxurious, and was likely made out of hay-filled bags, or a simple platform. It was a shared space, and people probably had to hit the hay on a regular basis to get rid of bugs. A modern bed, on the other hand, is comfortable and supportive, with […]