How much sleep and how to get enough sleep ???

It is considered that in order to get enough sleep , you need 8 hours. In fact, the time for a night's rest is different for everyone. And it affects not only the load during the day/week, but also the general regime, and genetics. I, for example, have a lot of 8 hours of sleep. For 6.5 or 7 hours, I get a great night's sleep. If you sleep more, you can be "broken". But I think that each of you is able to understand how much time you need to get enough sleep. For someone, 6 hours will be enough for this,and for someone, 10 hours.