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.
Stimulate your senses. The easiest way to stay awake is to stimulate your senses. There are a number of things you can do to make sure your ears, eyes, and even your nose are alert and active. The more parts of your body that are alert, the less likely it will be that you will fall asleep.