Night Owls and Back Pain: What's the Link?
In Japan, many government workers are feeling the ache. Not just any ache, but low back pain. It's a big problem. Why? Well, it might have something to do with their sleep patterns. Some people are night owls. They stay up late and wake up late. Others are early birds. They go to bed early and rise with the sun. This is called a person's chronotype. It's like their b...