Besides the time of sleep, the quality of sleep is also very important. Some people with good sleep quality can meet their sleep needs after sleeping for more than five hours, while some people are still sleepy after sleeping for eight hours and still can't meet the needs of work and study the next day.
Normal people have deep sleep and shallow sleep, and only enough deep sleep can make the body and brain fully rest and recuperate.
People with high sleep quality sleep more deeply, only need to sleep for more than five hours to meet the needs of work and life the next day, and they are still full of energy.
However, some people have a shallow sleep, always feel dreaming, easy to wake up, and need sleep time to remedy the lack of sleep quality. If there is no daytime sleepiness, it is appropriate for individuals to sleep for five or eight hours.