You've probably heard some variation of the phrase, "I can't think without my morning coffee." Worse yet, you might actually be unable to function without that caffeine boost.
But what about coffee -- and caffeine -- makes you feel alert, and ready for your day? Well it has a lot to do with the binding of caffeine to certain receptors in your brain, which as AsapSCIENCE explains, is "great for you if you're tired." However, your brain's response may make you sleepy, and trigger the need for more coffee. Watch below to find out why: