I'm glad someone else essentially sleeps with their books. I do it all the time. There's also nothing more delicious to me than waking up with a book open on your chest, having fallen asleep that way the night before.

The books that I have to stay away from late at night are my atlas and my copies of the SFE (http://en.wikipedia.org/wiki/Encyclopedia_of_science_fiction) and its companion fantasy volume (http://en.wikipedia.org/wiki/The_Encyclopedia_of_Fantasy). Oh, and Bartlett's (http://en.wikipedia.org/wiki/Bartlett%27s_Familiar_Quotations). Oh, and.... :)