Are you on any medication(s) now? If so what?
There are a number of meds that might help---but you probably should talk to your doc to determine what would work best for you.
(eg: in assessing this, it is important to know things like
-the frequency of the attacks
-anything non-medical that makes it worse/better more/less likely
-what your bedtime 'ritual' is &/or if you can develop one that will help
-if there are any daytime "triggers" you can address before sleep
-how long it has been going on, do you know what triggered this or is it random
-do you fall asleep easily, then wake in a panic, or does the fear of the attacks make falling asleep initially difficult---------------------------How do you "manage" now?