On a spring afternoon two years ago, freelance photographer Maki Umaba encountered an unusual scene on a train -- all the passengers on the car except herself were dozing. Some might have just closed their eyes, but others were sleeping soundly.
At that time Umaba was searching for "the most comfortable settings" for the subjects of her photography. When she saw those passengers peacefully napping in the warm sun, it occurred to her that sleep provides the ultimate comfort zone.
Since then, the 28-year-old has taken photos of more than 40 sleeping people, mainly her family, friends and acquaintances.