Millions of Americans sleep in front of the TV each night, but a new research suggests this may raise early death risk.
552 people aged 63 to 84 participated in a Northwestern University School of Medicine research on ambient light and health.
"People should avoid or decrease light exposure during sleep," study author Phyllis Zee told CNN.
The research also indicated that people were more likely to develop insulin resistance after sleeping in a dim area, such as a TV room.
"We're revealing a process that may explain why this occurs," Zee said. We demonstrate it affects glucose regulation.