Even dim candlelight before bed is bright enough to disrupt sleep

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By Clare Wilson

You may have heard that bright lighting in the evenings can disrupt your sleep. But it turns out some of us are more sensitive to this effect than others. A new study suggests people’s threshold for their body clock hormones being disturbed by late-night light can vary by more than fifty-fold.

“For some people, a dim reading light might as well be daylight, and for others it might as well be darkness,” says Sean Cain at Monash University …