Researchers in the UK and Israel have revealed that turning off lights at night may be able to actually prevent cancer.
"We believe that any turning on of artificial light in the night has an impact on the body clock. It's a very sensitive mechanism. If you want to get up to go to the toilet, you should avoid reaching for the light switch. There are some plug-in lights that just glow, that are safe and you could use them as an alternative," said Rachel Ben-Shlomo, of the University of Haifa.
For the study, researchers exposed mice to light in the night for one hour. The tests were performed at Leicester University by geneticist Professor Charalambos Kyriacou.
The researchers found that mice exposed to light had changes in the body clock. They concluded that exposure to light at night may lead to "over-expression" of cells linked to the formation of cancer.