Brian 'Head' Welch taken ill in Krasnoyarsk on band Korn's Russian tour.
He revealed his condition on Facebook, with a posting: 'I'm in hospital for a few days. So sorry Russia I cant be at a few shows. I have kidney stone.
Medical professionals have long touted the benefits of getting a good night's sleep, but according to a study from Duke-NUS Graduate Medical School in Singapore, a lack of sleep may just speed up the aging process in the brain.