First off, FAs are common and very normal. People who DON'T lucid dream have them, too. A FA is simply dreaming about waking up. Your expectations and reactions determine how you feel about them. Personally I find FAs to be annoying, but not anything more.

It is also possible that you are having HH (hypnagogic hallucinations). These are a very normal and healthy part of dreaming. Most people never even notice them. These are visual, auditory, tactile, etc. HH are the beginings of dreams that form when a person isn't fully asleep. HH can be as ordinary as printed words from a book you recently read, or it can be disturbing. The thing about HH that so often upsets people is the overwhelming sense of fear and danger when it happens. If you want to learn more about HH just google it. There is a lot of medical liturature out there about it.

Perhaps learning more about FAs and lucid dreaming will help you feel better about your experiences. If you find you are still afraid to sleep, I suggest talking to a doctor.

Good luck!