They say it’s not good “sleep hygiene” to read in bed. Your bed should be just for sleeping and, you know — baum-chicka-baum-baum! That way you associate your bed with sleeping (and/or sex) and sleep (or make whoopie) better.
(I added the stuff about making better whoopie, but by the law of associations, it makes sense, right?)
Problem is, I love reading in bed! I can’t give it up. No way.