How caffeine and alcohol affects your sleep

Caffeine wakes you up, and alcohol makes you nod off, right? It's not that simple. Sleep scientist Matt Walker takes us into the eye-opening ways that these drinks affect the quantity and quality of our sleep. https://www.ted.com/talks/matt_walker_how_caffeine_and_alcohol_affect_your_sleep?rid=b3WAvTMB8qGK#t-85361