Waking from sleep startled or suddenly indicates the mind inability to relax to the point for restful sleep. This can be due to multiple variables. Stress, trauma, medications, etc. The main thing is recognizing you're unable to sleep soundly. Your mind isn't shutting down enough to allow you to sleep soundly. For now decrease any caffeine intake and talk with your physician about it. Begin journaling when you awake to help process some of your thoughts. Begin focusing on processing some of your stressors, concerns, fears, etc. You'll then begin to see a decline in this occurring. I hope this helps some.

Belle