What to do for an adrenaline dump in the middle of the night?

I've started developing what I think are adrenaline dumps, especially at night. They wake me up around 3-4am and make it nearly impossible to go to sleep again. It's also starting to happen during the day too, especially when I'm at work. What can I do to help myself feel ok again? I work a very physical job and can't be out of commission for more than like 30 minutes.