Why do you have to sleep?

Kids love to stay up past their bedtime – and so do grownups! But why do we have bedtime at all? Why is sleep so important, and why does it naturally happen at night? And what does sleep have to do with memories, unicorns, and a flying trapeze? All your questions about shut-eye are answered on today’s episode of Who Smarted?

For more great resources about sleep, check out the non-profit Sleep Foundation.