"Western society is chronically sleep deprived"

Modern lifestyles may no longer be constrained by sunrise and sunset, but light remains one of the most powerful influences on our behaviour and wellbeing. This realisation has fuelled a “sleep hygiene” movement, whose proponents point out that bright lights before bedtime and spending the whole day in a dimly lit office can dampen the natural circadian cycle, leaving people in a continual mental twilight – dozy in the morning, and too alert to fall asleep promptly at night.

Rosbash welcomes this new awareness. “It’s been overlooked for a long time as a real public health problem,” he said. “All of western society is a little bit sleep deprived and, when I say a little bit, I mean chronically.”