So, I watched "The Science of Sleep" the other night, and the one character creates a device once he hears about REM. Basically it is attached to his eyelids, and once he enters REM and his eyes are moving, it presses play on a pre-recorded tape that starts talking to him in his dream. Would something like this be possible to make? On the tape you could record yourself saying "Do a reality check" or something like that. I guess you could always just set an alarm clock to when you normally enter REM.

but has anyone done anything like this? I think it would be really effective.