Suzanne Bertisch, MD, MPH, offers nighttime—and daytime—suggestions for better sleep in Harvard Health Blog.

Put away ALL electronics two hours before bedtime. Put away ALL electronics two hours before bedtime. (Yes, it’s so important, I am saying this twice!) Cell phones, tablets, and all electronic devices make it harder for your brain to turn off, and also may interfere with your body clock. If you must use your device, use a program that reduces blue light exposure, such as Night Shift in Apple products or f.lux for Android devices.