It is often frustrating when it's time to go to bed, our brain becomes the most active that causes us to over think things happening in our life. We could be lying on our bed wide awake for hours.
A trick is to visualise your breathing, as a rhythm or a colour. Visual aid allows your brain to focus on a single matter and easily bring yourself into a calm and relaxing status.
Yawning purposefully can also do the job to trick your brain into thinking you are more tired than you actually think. This is because it releases stress from the body and loosens your limbs by your side. Listening to calm and soothing music at the same time to help regulate your breathing and bring you into a more relaxing stage.