Sitting all day and feeling stressed makes our bodies slump forward. This makes our chest and shoulders very tight, which makes it hard for us to breathe deeply and relax for sleep. An Olympic physical therapist suggests a simple "chest-opening stretch." You just lie on a rolled-up towel along your spine and open your arms wide like the letters T and Y. This easy move opens up your chest and helps you take deep breaths. It tells your body it is time to relax, helping you fall into a much deeper and better sleep.