How much sleep you need basically depends on your genes. However, other factors such as age and health also play a crucial role. On an average, an adult needs between 7.5 and 8.5 hours of sleep every night.
A good night`s sleep a necessary to avoid sleep deprivation. There is also something called sleep debt that accumulates for every night that you don`t sleep for the required amount of time. These can manifest in many ways, some being feeling sleepy during the day, taking frequent naps, taking prolonged naps or sleeping excessively over the weekend.
So how much sleep do you actually need? Firstly, this depends on genes. You may need 8 to 10 hours sleep, or be satisfied with just 4 hours of sleep a night. On the other hand, you may need 12 hours of sleep. If you are not in the average, contact a doctor or sleep specialist to make sure that that is the required amount of sleep. People suffering from hypothyroidism or depression may have extreme sleep patterns.