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Recognition that the tendency of teenagers to go to bed and get up later has a biological basis (Features, January 5) comes as no surprise to those of us with teenage children. And if by the age of 55 we have reverted to the early waking times of 10-year-olds, for whom are the new early lecture slots, now in place in many universities, designed to suit - the students or thestaff?

Peter T. N. Spencer-Phillips
Head of the School of Biosciences
University of the West of England