A diets rich in fruit, nuts and fermented food can benefit your microbiota, and improve sleep quality. Oleksandra Naumenko/Shutterstock It’s no accident that we spend a third of our lives asleep. It is essential to our health, and even animals for whom resting is complicated – such as aquatic mammals that need to surface to breathe, or birds that go up to 10 days without touching dry land – manage to sleep with surprising adaptations. But while we sleep, the tens of trillions of microorganisms