when I saw the title, I thought you were going to try to sit still in a chair for 6 hours for an indoor pinhole self-portrait. That would take some concentrated self-control! Neat idea. A similar idea would be to set up an intervalometer and take a flash multiple-exposure every 30 minutes or hour. You'd get your sleep positions superimposed, but still relatively sharp...
That's right, I'll change the title.
The flash idea is nice too, but I lack the right equipment here. I'm on a trip.
Edit: I can't change the title.



