Do you really need 8 hours of sleep every night?

When you can't sleep, you're desperate for help. And there's a booming industry waiting to tell you all the ways a lack of sleep can ruin your health -- and to sell you fancy gadgets to help you finally doze off. Shedding light on this flawed doomsday messaging, Dr. Jen Gunter explains why you shouldn't lose sleep over sleep -- and what to do instead. (For more on how your body works, tune in to her podcast, Body Stuff with Dr. Jen Gunter, from the TED Audio Collective.)