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.
1 Remember to REM: If you have to stay awake before an exam get at least 6 hours of sleep the night before. 2  This will allow you to get at least some amount of REM sleep, which occurs later in the night and helps consolidate your memories. Remember to REM: If you have to stay awake before an exam get at least 6 hours of sleep the night before. 2  This will allow you to get at least some amount of REM sleep, which occurs later in the night and helps consolidate your memories.