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.
How about doing it 11 days in a row? A man in Cornwall, England, actually went 11 consecutive days without a wink of sleep. On May 24, 2007, Tony Wright, a 42-year-old horticulturalist, claimed to have beaten the record of 264 hours (exactly 11 days) set in 1964 by 17-year-old American Randy Gardner. Wright had some practice: he had already been through more than 100 sleep deprivation experiments, the longest one lasting eight days. He also employed a unique raw-food diet. Wright claims that his regimen of salads, avocados, bananas, pineapples, nuts, seeds, carrot juice and herbal tea helped his brain stay awake.