How to determine sleep quality

Sleep quality is divided into two types: with dreams and without dreams. Furthermore, if a person sleeps without dreams there are deep and light sleep stages of sleep .

There are two standards referring to sleep quality: first, whether there is enough time for deep sleep; second, whether the percentage of dreaming during sleep is appropriate.

"The sleep quality of young people is better because the ratio of their deep sleep time is higher and time of sleeping while dreaming is more, but elderly people sleep more lightly." Guo analyzed.

For most people, there are three simple standards to determine sleep quality: first, people should falling asleep at about 10 pm; second, sleep time should last 7 to 8 hours for an adult; third, a person should feel refreshed and energetic after waking up.