Sleeping at night always feel hot, first of all, we should exclude the objective environmental factors, whether the temperature is too high, and secondly, we should consider fever or metabolic hyperfunction and other problems. In the summer high temperature season, the indoor temperature exceeds 30 degrees will make people feel stuffy, sleep at night will feel hot and uncomfortable. Lowering the indoor temperature by blowing air or turning on the air conditioner can improve the environment. If you feel hot at night, you should also rule out the presence of abnormal body temperature. Colds, inflammatory infections or immune system disorders can raise body temperature. If the temperature is higher than normal, a thermometer should be used to measure the body temperature, and further blood tests or immunological tests should be done to confirm the diagnosis and further treatment. The presence of hypermetabolism, such as hyperthyroidism, diabetes and other factors to increase the metabolism, sleep at night will feel hot. If you have been drinking too much, eating too much and losing weight, you need to go to the hospital for further thyroid function and blood glucose tests to make a clear diagnosis.