Lack of sleep
Q28 It is estimated that the average man or woman needs between seven-and-a-half and eight hours’ sleep a night. Some can manage on a lot less. Baroness Thatcher, for example, was reported to be able to get by on four hours’ sleep a night when she was Prime Minister of Britain. Dr Jill Wilkinson, senior lecturer in psychology at Surrey University and co-author of ‘Psychology in Counselling and Therapeutic Practice’, states that healthy individuals sleeping less than five hours or even as little as two hours in every 24 hours are rare, but represent a sizeable minority.