Macrophages of the immune system - cells that seek out and kill pathogens - are controlled by circadian rhythm, the 24-hour day-night cycle, which could have implications for disease treatment and vaccine efficacy.

Large study uncovers strong links between a person's diet, the microbes in their gut, and their health. These findings could be used to provide personalized dietary advice for better health, based on microbiome testing.

A study of the water-dwelling hydra found that the organisms show signs of sleep despite not having a brain or central nervous system, suggesting that animals acquired the need for sleep before developing brains.

Oolong tea, which lies somewhere in between green and black tea, increased fat oxidation overnight when people consumed 2 or more cups of the tea per day.