https://blog.wellcare-global.com/blog/how-much-deep-sleep-do-we-need We spend around one-third of our life sleeping but have you ever wondered, “How much sleep do we need?” Some might say 7-8 hours; some might argue that it depends on how old you are... etc. Well, let’s start with a simple question “Why do we sleep?” Then we’ll go through more details into sleeping itself, deep sleep, and how much deep sleep do we need?