How does coffee keep you awake?

Coffee is known for giving people energy. In fact, some say they can’t start their day without coffee! It made us wonder why coffee helps us stay awake.  We asked dietician and nutritionist Maria Cruz to help us find the answer. Got a question that’s percolating in your brain? Send it to us at BrainsOn.org/contact, and we’ll find an answer and spill the beans for you. See omnystudio.com/listener for privacy information.