Packed with practical advice and information from a leading neurologist—from what causes migraines to how sinus pain happens to whether we should just reach for the painkillers and ignore the root causes—this is Why We Sleep for the head. There is nothing novel about headache. Since time immemorial, humans have suffered in its grip. Medieval Persia was a hotbed of intense debate over how to avoid and subsequently cure headache, and castor oil seemed to be prevalent as a remedy. Thankfully we have moved on. Darwin became a recluse because of his headaches. Are headaches trying to tell us something. How do we find out what that is? What is the point of pain?