There are many reasons for less sleep, mainly the following aspects: 1, physiological factors: such as overworked brain excitement caused by sleep reduction, stay up late causing biological clock disorders resulting in less sleep, unsuitable environment can also be caused, with the growth of age, sleep time will also be shortened, do not need too much treatment, remove the cause can be alleviated. 2, mental factors: such as anxiety, depression, neurasthenia 3, other disease factors: such as hyperthyroidism patients will sleep less, cough at night, will also affect sleep or nocturnal urinary frequency, urinary urgency, affecting sleep resulting in less sleep, for these cases need to be individualized according to the cause of treatment.