Скачать или смотреть “Coffee Makes Me Sleepy”

Source: @kdimerc

Caffeine is often thought of as a source of energy, but in reality, it doesn’t actually create energy in the body. Instead, it works by blocking the signals that make you feel tired. Normally, as you go about your day, a chemical called adenosine builds up in your brain, binding to receptors that trigger drowsiness and signal it’s time to rest.
Caffeine closely resembles adenosine in structure, so when you drink coffee, tea, or another caffeinated drink, it slips into those receptors and blocks them. This prevents your brain from registering just how tired you really are, creating the sensation of alertness and wakefulness. The effect is temporary, though—once the caffeine wears off, the adenosine that’s been building up can hit you all at once, leading to the familiar “crash.”

#caffeine #coffee #adhd