The best sleep time for normal adults is 6-8 hours per day, and the normal sleep time can be increased to 8-10 hours for children or the elderly. Therefore, it is normal for adults to sleep 6 hours a day, but the sleep time is low. At this time, it is recommended to ensure that the deep sleep phase is more than 4 hours, and the light sleep phase is controlled within two hours as much as possible, in order to effectively achieve sleep quality and relieve the excessive fatigue and excessive weakness of the nerves. For 6 hours of sleep per day, if it belongs to the natural sleep and natural waking, it can also be a normal situation. However, it is not normal to maintain 6 hours of sleep with the help of some medications, such as melatonin tablets or estradiol tablets, and the deep sleep phase is insufficient.