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.
Four Parts:Staying Up All NightResting During the DayKeeping Your Body HealthyChoosing a Long-Term Nocturnal LifestyleCommunity Q&A. Humans have a circadian rhythm that causes us to sleep during the night and stay awake during the day.