Scientists find a "euphoric" side to sleep deprivation. March 30, 2011— -- It's easy to spot someone who has missed an entire night of sleep. Grumpy. Irritable. Focusing on the negative.

Sleep deprivation doesn't just hinder our ability ... A group of 30 women across the UK - including supermodel Jodie Kidd - had their photos taken and their skin analysed following a night of ...