A NEW campaign is urging people between the ages of 45 and 65 to have regular "drink-free" days. Middle-aged drinkers are more likely than other age group to drink more than the recommended 14 units a week. A YouGov poll also shows that they find cutting back on alcohol far harder than eating healthily or exercising. Doctors say "drink-free" days will improve sleep, help with weight loss and reduce the risk of high blood pressure and cancer. Dr Julia Verne, a spokeswoman on liver disease for Public Health England said: "Having a day off drinking gives you a chance to clean your system and give your liver a rest. It also has an immediate impact on your sleep and calorie…