For questions 25-32, choose the answer (A, B, C or D)which best completes each sentence.
Mark your answer on the answer sheet.
There is an example at the beginning (0).
Clock change leaves teenagers more sleepy
Researchers at Surrey University have studied the effects of the move to British Summer Time (0) on teenage schoolchildren. They found that the amount they sleep decreases following the clock change and they can suffer
sleep deprivation. They also found that
before the change, the teenagers were getting less than the recommended hours of sleep.
The need for more sleep is something teenagers are
with. Sleep researcher Joanne Bower said: “If we don’t get enough sleep, we can find problems with performance, concentration, and mood. We’re lucky we are quite
in that we generally do have an amazing ability to bounce back.”
The students were studied using wristwatches. These were
constantly over a 10-day period before and after the clock change. 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 on average less than six hours of sleep
night.
Mrs Bower said: “The body clock, which makes sure the same things happen in the body
the same time every day, undergoes a shift during adolescence. The shift includes a delay in the production of the sleep-promoting hormone, melatonin. This
teenagers are awake later in the evening and find it difficult to rise early in the morning. Add this to the clock change, and teenagers may suffer more than most.”
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