Working night shifts can be disorienting and upsetting, especially at the beginning. These tips can help with the adjustment process. You don’t need a science degree to figure out that people need sleep. But countless research points to the same conclusion: insufficient sleep can cause a wide range of physical and mental health problems, from poor judgment to depression to heart disease. And ideally, humans should get the sleep they need at night and stay active during the day. 1. Develop a ...