India, Feb. 6 -- The importance of sleep in leading a healthy life can rarely be overstated. While it is a natural process for all living beings, how it exactly works continues to be a complex and fascinating phenomenon.

While we consider sleep as a time of rest, our bodies are very much active throughout the period. According to the Cleveland Clinic, important things taking place while we are sleeping include:

While an adult needs between seven to nine hours of sleep every day, it is possible for an individual to remain tired after sleeping for eight hours. Dr Saurabh Sethi, a California-based gastroenterologist trained in AIIMS, Harvard, and Stanford Universities, took to Instagram on February 6 to explain the phenomenon.

According t...