Being awake when sleep paralysis occurs can be caused by many factors, high stress, sleeping in a supine position (on your back), screwed up circadian rhythms, etc.The paralytic state is actually part of the sleep cycle, you enter it during REM, it's a mechanism to protect the body from getting hurt. What's happening is your body is still half-asleep when you enter it. If you are truly concerned, then by all means, see a doctor. Caffeine is a stimulant and will cause your body to be in a more alert state making it harder to fall asleep regularly, it can seriously mess up your biological clock. iIf you can, reduce the intake.