A comprehensive guide to the science of sleep - and how it impacts everything we do.Sleep is a ritual that unites us all. But why do we do it? This documentary reveals how sleep affects almost every part of our physical and mental wellbeing, from memory and mood to immunity, weight and fertility. New research and theories are put to the test in experiments never before shown on TV. And in the UK's biggest-ever sleep survey, discover how sleeping habits vary across age, lifestyle and location. Accessible and genuinely useful, this is the startling science behind our slumber.

Originally released by BBC Worldwide Learning, 2022. Streaming video file encoded with permission for digital streaming by Infobase on June 03, 2022.