Structure of Haemoglobin: Haemoglobin is an aggregation of four globular proteins (typically two alpha and two beta subunits), each with an embedded haeme group. Each haeme group allows the binding of an oxygen molecule.
Here's another intriguing case from the Guinness World Records. In 1964, a 17-year-old high school student named Randy Gardner beat the world record for sleep deprivation by staying awake for 264 hours (11 days) without using any stimulants.
Coffee's ability to keep you awake is all thanks to its primary constituent-caffeine. Caffeine works by changing the chemistry of the brain. It blocks the action of a natural brain chemical that is associated with sleep.How sleep sets in Drowsiness is caused by the slowing down of nerve cell activity in your brain.offee's ability to keep you awake is all thanks to its primary constituent-caffeine. Caffeine works by changing the chemistry of the brain. It blocks the action of a natural brain chemical that is associated with sleep.