When I invited my friend Sarah to join me in trying sensory deprivation tanks, as invented in 1954 by a so-called “consciousness researcher” named John C. Lilly, I saw a flash of understanding on her ...

Feeling exhausted despite getting enough sleep? You may be rest-deprived. Many of us equate the word “rest” with “sleep.” While sleep is important, it's only one part of the picture. Different ...