[spacekadet]

Originally Posted by Tim McKittrick

A few moments with uncle Google finds:

http://www.amazon.com/Zapper-NZ-1-Dr.../dp/B000V5J3SE

http://www.5starshine.com/info-nap-z...alert-aid.html

I don't know if either will fit in a helmet though.....

I could not see any info about how those things work - do you know if they are mechanical, i.e. pressure from the droopy head? Or is it a beam on the eye? Beam would possibly work but mechanical would not.