Many people face the problem of water retention which results in swelling all over the body. Also reactions to certain foods or exposure to chemicals can result in this problem. Now a new study has found that lack of sleep can also result in swelling all over. The study conducted at the University of Eastern Finland says that men who sleep less than six or more than 10 hours suffer from low-grade inflammation as compared to men who sleep for seven to eight hours per night. Furthermore low-grade inflammation occurs more in people who are overweight depressed and have diabetes.