Nice to see people notice this thread.

This project is currently on hold. I did measure my EEG for few nights but there were nowhere as clear patterns as the literature indicates. Maybe my Aspergers has some to do with that. Too bad. I will try it again later.

Werewolf, I really don't think the heartrate is the way to go. But I could be wrong.

Skybluelucid. The method of signaling is like the icing on the cake. We're nowhere close to choosing that. Having said that, you may be right about the undesirability of vibration. I think people should get to choose their method of signaling.

The parallax seems expensive if it's up to 89 dollars, but I'm not sure.