A night without sleep is also called sleep difficulty, is a type of insomnia, caused by a number of reasons, the common causes are mainly the following aspects: First, physiological factors, with age, the person’s sleep time will be shortened accordingly, easy to cause difficulty in falling asleep, sleep maintenance time is short, easy to wake up early and other symptoms, for this case, you can take drugs to help sleep to deal with the symptoms. Second, environmental factors, such as indoor temperature is not suitable, light is too strong, sleep environment is too noisy and other factors can also affect the sleep situation, resulting in insomnia, dreamy. Third, drug factors, many drugs are easy to stimulate the central nervous system, such as asthma drugs aminophylline, caffeine and glucocorticoid hormone drugs can lead to sleep disorders, insomnia, hypersomnia symptoms. Fourth, the factors of disease, such as vegetative nerve disorders, hyperthyroidism, anxiety, depression and other patients are often accompanied by sleep disorders, need to target the primary disease to treat the cause in order to effectively improve the symptoms.