Why are you grumpy after a bad night of sleep? Are computers smarter than humans? What happens in the brain with ALS? Can brain implants read and control our minds? Why is some information stored so quickly in the brain, while other information takes much longer? Is the brain more or less active during sleep? Why is sleep so essential? How do brain cells communicate with each other? Can I learn from a text by listening to it while I sleep?  Can you unlearn sleeping in the dark?