This is why you can’t move when you wake up: At night when we sleep, our back stops producing anti-inflammatory protein, so the body takes some time to recover in the morning, which is why we feel pain on waking, research by scientists at Manchester University featured in a Telegraph article says. The discovery makes it possible to develop new drugs for arthritis and can help adjusting the time when a drug should be administered to be more effective. One more thing: You don’t have to just worry about your brain when you’re jet-lagged, now add your back to the list: “Researchers at the University of Manchester also found that discs in the spine have 24-hour body clocks, which when they do not work properly can contribute to lower back pain,” the article says. Explains a lot about the health condition of us at the night shift, as the article specifically advises against “night working” and “rotating shift work.”