Why does putting back the clocks an hour disrupt us so much?

By John Groeger, Professor of Psychology, School of Social Sciences, Nottingham Trent University

The disruption of sleeping and waking patterns from the daylight saving clock change reveals a great deal about our everyday reliance on the interaction of sleep pressure and circadian clocks.

First, you need to understand the intricate changes happening in your body the night the clocks go back an hour. On Saturday evening, assuming we are not in bright light, our bodies will begin the daily chore of secreting melatonin, a key hormone for the timing of sleep. This will…

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