How many hours of sleep are recommended for metabolic function in adults?

No matter who you are, sleep is essential for your health. However, when life gets busy, it can be one of the first things to get neglected or sacrificed. That is unfortunate because getting enough sleep is as vital to good health as eating healthy foods or doing exercise. In adults (18-64 years), 7 to 9 hours of sleep per night is recommended for optimal metabolic function. However, some people might need more or less sleep than is generally recommended.

Source: Healthline