In hazy spring sunshine on Saturday, hundreds of young Seoulites turned up at a park by the Han river at the invitation of the city government ​to try to do something many overworked South Koreans never get enough of – ‌sleep. The Seoul Metropolitan Government staged its third annual spring event, dubbed a power nap contest, from 3pm local time, under a refreshed set of admission requirements for the participants: wear outfits befitting either a sleeping beauty ​or prince, come tired, with a full belly. For a metropolis that famously runs on ​24-hour shopping malls, competitive hustle and iced Americanos, the underlying exhaustion on the ⁠lawn was palpable. "Between exam prep and part-time jobs, I survive on three or four ​hours of sleep a night, patching it up with desk naps during the day," said Park ​Jun Seok, who showed up draped in the silken, crimson robes of a Joseon Dynasty monarch.…