Many people may have resolved to place a bigger emphasis on relaxation and this can be achieved without the need for unrealistic levels of self-denial.

Napoleon, Florence Nightingale and Margaret Thatcher got by on four hours a night but most people do need more to avoid that alarm clock grogginess after a late night. No one is really sure why we need sleep. Some believe that sleep gives the body a chance to recuperate from the day's activities but in reality, the amount of energy saved by sleeping for even eight hours is tiny.