One way to combat insomnia is to get up really early to start your day, say, at about 5am. Exercise for half an hour at some point during the day, but finish the workout at least three hours prior to bedtime. First thing in the morning is best. Eat three healthy meals during the day, and make sure your last meal is at least a couple hours earlier than bedtime. Avoid any added sugar in your food and beverages. Do not consume any caffeine at all after about 3pm. Drink one or more cups of chamomile tea in the hour before bedtime. If none of this works, try using melatonin supplements in the last 20 minutes before bedtime. Take a hot bath or shower just before bed, too. Wear comfy pajamas and socks to bed, because a slightly overwarm body can fall asleep more easily than a slightly cold body.
Occasionally, my sleep schedule gets out of whack, for a variety of reasons, and a day or two of this treatment never fails to put me to rights again.
Oh, one last idea: use an sleep eye mask and, laying on your side, put a pillow over your exposed ear. The deprivation of light and sound really helps. And sometimes, talking to God in your heart about all your worries and troubles will help you drift off to sleep.
God bless and sweet dreams!