Going Clear, Lawrence Wright's book about Scientology, is pretty great.
Everybody seems to like Devil in the White City, by Erik Larson. I did, far more than his other books.
I second 8893's nomination of Life by Keith Richards. The blurb on the back says something like, "Reading this book is like being allowed to sit in a room with Keith Richards and ask him every question you'd ever want to ask him." Definitely one of the top 5 autobiographies I've ever read. (I don't often think of Keith Richards and Malcolm X together.)
Whatever you do, don't read H is for Hawk, by Helen Macdonald. Unless you're suffering from insomnia. Then, definitely.
I tend to read more fiction than non-fiction. I enjoy the escape.