 Welcome back. The time is now 5.40. For many of us, especially here of us on this morning show, caffeine is a part of life. It's consumed daily about 80% of adults worldwide. And dietician Julia Zupano with Cleveland Clinic says it works by blocking Anderson receptors in your brain, which promotes sleep. Now, those receptors slow down nerve activity, which can make us feel tired. That explains the afternoon crash some may feel when the effects of their morning coffee starts to wear off.