librocubicularist, one who reads in bed -- this was easy enough to find here with an AND search; here's the link:
http://wordsmith.org/board/showthreaded.pl?Cat=&Board=education&Number=70985

OneLook has a reverse dictionary (Beta version) which can be pretty funny to use. I tried the "reads under covers" string and got results such as "equal rights amendment", "conjunctiva", "leningrad cowboys", and "underpants"!

Googling ["librocubicularist" dictionary OR glossary OR words OR terms OR lexicon] revealed Christopher Morley's "The Haunted Bookshop": http://www.worldwideschool.org/library/books/lit/romance/TheHauntedBookshop/chap10.html