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.
sleeping rewires your brain. However, the sleep that is most beneficial to feel refreshed and not fatigued is stage 4 and REM sleep. Your brain needs to recover from working all day. sleeping rewires your brain. However, the sleep that is most beneficial to feel refreshed and not fatigued is stage 4 and REM sleep.