Lavender induces relaxation. If you pour a few drops of essential oil onto a cotton ball and place it next to your bed, it will relax you and help you to sleep. Or you can pour a few drops in the corner of your shower and the steam will really relax you. The scent can be strong, so don't go overboard. Or you may prefer a lavender scented body lotion.
Chamomile tea is also good for relaxing. Drink some before going to bed.
Stretches for relaxation or a good massage will also help.