Before you go to bed, make sure that where you sleep is comfortable, and that the temperature, light and noises levels are right for you. People have different ideas of what is comfortable, so you may need to experiment to work out what works best for you. On the whole, dark, quiet and cool environments generally make it easier to sleep.
If there is anything particular that is disturbing your sleep in the night, for example if you have a partner that snores, or a loud clock that keeps you awake, try to find a solution. You may want to sleep in a different room from your partner for a few nights or use earplugs to block out any noise. Using blackout blinds or curtains may be helpful if light is stopping you from sleeping.