Adrian Storey's photo series focuses on the sleep-deprived:

The photographer, also known as Uchujin, has taken it upon himself to capture all of the dreaming citizens of Tokyo, where he is currently based. The series, titled Let the Poets Cry Themselves to Sleep, features plenty of commuters that can't seem to keep their eyes open, lounging in the most unusually public spaces.

(Image used with Storey's permission)