Sleeping for more than ten hours a day is not a normal performance. A normal person should sleep between 7-9 hours a day. If you sleep for more than a dozen hours a day and have obvious signs of sleepiness you need to clarify whether a sleep disorder has occurred. The most common cause of this sleep disorder is sleep apnea syndrome, although the total time of sleep is enough, but the poor quality of sleep leads to poor rest, always feel sleepy and weak, respiratory sleep monitoring can confirm this disease, the main reason is that sleep apnea caused by the brain ischemia, hypoxia, a short period of time will not cause obvious effects, but after a long time will cause the brain It will not cause any significant effect in a short period of time, but after a long period of time, it will cause the brain to be slow to react and memory to decline, which may lead to dementia. In addition, other factors should be ruled out, such as environmental factors, such as excessive noise, sweltering heat, lack of air circulation, or symptoms of anxiety or depression that cause excessive dreaming and shortened deep sleep time.