Sleep expert Matthew Walker shares his outlook on the meaning, role, and importance of a good night's sleep for a healthy and fulfilling life.

We spend approximately one-third of our lives asleep.

But how important is it to our health beyond the obvious?

A lack of sleep can increase our risk of developing physical illnesses, and impact our perceptions and learning abilities.

Matthew Walker is a scientist and professor of neuroscience and psychology at the University of California, Berkeley.

His book, Why We Sleep: Unlocking the Power of Sleep and Dreams, focuses greatly on mental health and the understanding of human sleep.

In this Uptime Hack, find out how Walker unravels the impact quality sleep can have on our psyche and general wellbeing.