Quality of the sleep: the majority is difficult to maintain sleep, the next is insomnia at the beginning of the sleep and insomnia in the end of the sleep is at least, the patients averagely go to bed at 22 o'clock, take about 75 minutes before falling asleep, awake 3 - 4 times a night, then take 30 minutes to be back to sleep, wake up in the morning at around 4 A.M. and have the duration of sleep per night of 4 hours and 30 minutes on average.