One of the most important things to try is to get offline at least an hour (if that's impossible, go for half an hour) before bed, and don't take your phone with you. It can be tempting to keep checking mail, especially as we all get busier, right up until we fall asleep. But, unless you have a true emergency, honestly there is very little that can't wait until morning. The issue is twofold: first, the constant influx of information turns on our brains, and we keep thinking about everything from job responsibilities to relationship stress; second, the light created by phones and computers in and of itself, is a problem. The bright light-- that mimics dawn-- sends a message to our brains that it's time to get up. Try shutting down social media before bedtime to shut down stress.