We all know that our bodies are amazing, but we didn't realise quite how amazing they were until we watched this video.
In five minutes, AsapSCIENCE shows us how the inner workings of our biological clocks are ticking, and it's pretty incredible.
From waking up to going to bed, this video explains what you're body is doing while you're getting on with your day.
For instance, did you know that when you wake up you're actually moody because there's a 50% increase in stress hormone, coristol, pumping through your blood stream preparing you for the day?
And that during cocktail hour you're actually more tolerant to the effects of alcohol, so after work is actually the perfect time to get boozy?
It's simply brilliant. And while you're on AsapSCIENCE's channel, make sure to watch their sciencey cover of Taylor Swift. It's awesome.