Natural remedies. Set the stage for sleep - darken your room, do not do work in the bedroom, avoid watching tv or using screen such as computers as the blue light can be too stimulating. Reduce stimulants that you take earlier including alcohol. Take a warm bath or shower. Use calming aromatherapy such as lavender, chamomile, hops. Massage your feet. Have a warm cup of tea (chamomile, lemon balm, valerian).
Exercise. But not at night before bed. Then the endorphins will keep you awake !
Stay active. Exercise is a great way to relieve stress. Your body releases endorphins during exercise, which can help you feel calm. If you exercise 30 - 60 minutes a day, your stress levels can improve. When stressed, take 5 slow, deep breaths with your eyes closed, then roll your shoulders forward 5 times, then back 5 times. This will slow your heart rate and release tension in your neck and shoulders.