Close Skip to main content sign in search jobs more jobs switch to the UK edition switch to the AU edition US edition switch to the UK edition switch to the Australia edition The Guardian Winner of the Pulitzer prize home › science home US world opinion sports soccer tech arts lifestyle fashion business money travel environment all sections close Neuroscience Half an hour of brain stimulation on sleep-deprived military staff improved their performance twice as much as caffeine Compared with caffeine or a placebo, electrical brain stimulation reduced drowsiness and improved energy and mood. Illustration: Sebastian Kaulitzki/Alamy Ian Sample , science editor Wednesday 19 November 20...