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Teenagers can suffer severe sleep deprivation when the clocks change, say researchers at the University of Surrey. The amount they sleep decreases to less than six hours a night on average the week following the move to British Summer Time. During this period their concentration may be lower and mood affected. Scientists also found that even before the change, teenagers were getting less than the recommended hours of sleep. The activity of some sixth-form students from Claremont Fan Court School in Surrey was studied using wristwatches. These were worn constantly over a 10-day period before and after the clocks moved forward on 25 March. The watches reliably indicated when the teenagers were awake and asleep. The researchers found that in the days following the clock change, the teenagers had less than six hours of sleep a night. Adults generally have eight.