In this Daily Dose, Chris and Xand are returning to their episode on sleep with Professor of Circadian Neuroscience, Russell Foster. As a sleep expert, Russell explained why we can perhaps relax a bit when it comes to sleep, especially when it comes to losing some from time to time.

Daily Doses of expert wisdom from previous episodes will be dropping each weekday throughout January (except Tuesdays). You'll find them in the What’s Up Docs? feed on BBC Sounds, alongside all the main episodes of the podcast.