Not drinking alcohol and avoiding caffeine are two of the main ways you can enjoy better sleep at night. If you are feeling stressed about something before bed, then make a note about it for tomorrow. This will help you compartmentalise it and stop you from dwelling on it. A milky drink before bedtime has a soporific effect, so try this out. Allow your bedroom to be lower in temperature than your body. This is known to help people fall asleep and then to go on to enjoy less interrupted, better sleep.