Opening Skinner’s Box by Lauren Slater
Dreamland: Adventures in the Strange Science of Sleep by David K. Randall
The Examined Life by Stephen Grosz
The Man Who Mistook His Wife For A Hat and Other Clinical Tales by Oliver Sacks
Drunk Tank Pink by Adam Alter
The Art of Loving by Erich Fromm
Spook: Science Tackles the Afterlife by Mary Roach
Suicide by Emile Durkheim, although this is really sociology