If you tend to wake up at night, turn your clock around
When you see what time it is, you instantly start to panic about not being able to get back to sleep and being exhausted tomorrow. All of a sudden you’ve created a level of anxiety for yourself that makes it harder to go back to sleep.
Turn down the thermostat
Set it about two degrees cooler than what you’re normally comfortable at. Studies show we sleep better when it’s cooler.