ANYONE who has spent time working in China will have noticed how everything grinds to a halt at lunch time,which lasts from noon to 1:30 p.m.Nothing interrupts lunch.And what follows lunch is a phenomenon that is at first amusing,then irritating and finally simply accepted as the status quo, This phenomenon is the post-lunch nap or shui wu jiao.It happens right before your eyes-office colleagues will cover themselves with coats and lean back in their chairs,slump over desks resting heads on forearms,or,in extreme cases,hop onto their camp beds,relaxing for a 30-minute snooze.For someone witnessing this for the first time,it's astonishing to see the speed at which a co-worker transitions from open-eyed consciousness,to a deep sleep-state.This change is almost magical in its suddenness.