Healthy Sleep Improves Immunity

German researchers conducted an experiment in which volunteers were observed for two 24-hour sessions. During this time, the concentration of T-lymphocytes in their blood, which play an important role in the immune system, was measured. It turned out that the blood analysis results largely depended on the amount of sleep. People who slept at night had an improved ability of T-cells to migrate to lymph nodes. The crucial factors for such behavior were growth hormone and prolactin. These substances can be used in the future to stimulate the immune response of the body after vaccination.