© Paul Bradbury/Getty ImagesA rigorous new study that examined the health effects of coffee consumption found good news and bad news for coffee lovers. It showed that people lost about 36 minutes of nightly sleep on days when they drank coffee — and the more coffee they drank, the less they slept. The research also looked at coffee’s effect on heart palpitations, a relatively common experience for healthy coffee drinkers. The findings suggest that the health effects of coffee are complex. Marcus at UCSF said it’s not clear why people walked an extra 1,000 steps on days when they drank coffee.