When I read in bed, I use this Z-light that is sold at Borders. And, believe it or not, recently I've been trying it with the light attached to the case on the right hand side of the reader instead of at the top, like I think everyone else has been doing.
I think this is the one...
http://www.biggerandbrighter.com/boo...ems/GP-03.html
and at
https://www.mobileread.com/forums/showthread.php?t=8804