"Strategic Wakeup for Power Napping." The Jetlog 24×7 PowerNapping Springboard Module is a Visor plugin with a button and a set of headphones. As long as your hand is on the button, the headphones are silent; once your hand slips off, the cans start beeping until you wake up. The idea is to allow napping without REM sleep, compliant with NASA's Fatigue Countermeasures Program.LinkDiscuss (Thanks, ronks!)