Dunno, Ive always liked gadgets. I made my first lucid dream machine in 1986. Just grabs my attention, that's why I'm here. I don't expect this to work but one of Gysin's friends played around with this for years and his results were displayed in a journal in the 60's I think. Im going to get some veroboard and put a simple oscillating timer on it with a couple of white LED's. I'll have a switch for frquencies from 8 to 13 Hz and a dimmer for the LED's to get the right brightness. Then I'll stick the board in the pouch that is on my lucid dreaming mask that is in my drawer. Looks like it's going to get some use after all !!!