Actually it's no problem for sleeping with it on my face. I am used to using the sleeping mask anyway, and you can't even feel the LEDs, because they're not quite touching your eyelids.

Update for last night: If I could just quit getting woken up from external sources, this thing would work great. For the second time in a row, I have noticed one weird behavior though: Sometime during the night, my brain flips out, and I keep thinking I have to turn on the mask, or reconnect some wire, or the solder didn't hold so the wires are all sticking off. Of course this is nonsense, and the mask goes off shortly after, but both nights I've noticed my mind going through this loop. Last night I used it as a reality check, and was able to get lucidity, but my dream was foggy, as if it hadn't developed into a full dream yet. I did notice the flashing later in the early morning as well, but with my girlfriend getting up and going in and out of the bedroom I wasn't dreaming anyway.

I still have faith in the device though, my sleep schedule has just been unfairly interrupted the last couple of days.

More updates as I have them! Any questions, I'm watching this thread.