This typically results from excessive stress and/or anxiety
experienced during waking hours. If so, some basic stress management
will help, along with getting some good sweaty exercise most every day.
Very important for you to set and keep a consistent sleep-wake schedule 7 days a week, especially a consistent wake time. Allow no more time in bed than you normally need. Don't sleep in, and don't nap, because that may in effect steal sleep from you the following night.