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Why testosterone prescriptions are on the increase in the UK and growing concern amongst some doctors that these supplements may be linked to heart attack. Do the hours spent on laptops or tablets before bedtime disrupt your sleep? Dr Margaret McCartney reviews the evidence for later school start times for teenagers to match their natural bodyclocks. And a listener's concern about antidepressants in pregancy - 1 in 30 women take medication for depression whilst expecting a baby, but does the science suggest these drugs are harmful?