On the occasion of World Sleep Day, a sleep-in-forest competition kicked off on Saturday at Dongping National Forest Park on Shanghai's Chongming Island, with the first batch of 43 participants exposed to the fresh air and immersed in greenery for good sleep and a cash prize.

The competition will be regularly held from 9 am to 7:20 pm on Saturdays through April 26, as well as on May 2 and 3.

To decide the winners, competitors' sleep conditions will be objectively recorded by professional sleep monitoring devices, which comprehensively evaluate sleep quality. Data metrics include sleep latency, total sleep duration, deep sleep percentage, and sleep continuity.

Aiming to free urban residents from their daily hustle and bustle, the contest is extensively open to healthy individuals aged 18 to 50. Falling asleep is not mandatory for the competition, participants are allowed to engage in restful activities, such as simply closing their eyes or lying still.