Introduction

Just One Thing is a weekly podcast from the BBC World Service. Each week, Dr Michael Mosley explores one thing you can start doing tomorrow to improve your health or life in ways you might not expect. This week we ask Becky to walk every morning for 30 minutes within two hours of waking up and see how quickly she feels the benefits. If you're struggling to sleep at night, it could be because you're not getting enough bright light, particularly in the morning. Early exposure to light can actually reduce the amount of time you wake up during the night so you get a deeper and better sleep.