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You report calls for US schools to delay their opening times to 8.30 am or later (30 August, p 6). These are based on teenagers' body clocks shifting and causing them to go to bed and wake up 2 hours later than they did previously. Because the effect is linked to body clocks, it is likely to be related to solar time rather than the time on our clocks and watches.
This could easily be tested by measuring the relative success of pupils on each side of a time zone. You would expect those living to the east of it to do better, since they start their day at a later solar time.
Benefits may also be seen when the clocks go back for the winter months, and negative effects when they go forward. This should be considered by those who argue that the UK should move forward an hour to synchronise with Central European Time.