WHY WE NEED SLEEP? AREAS OF THE BRAIN INVOLVED IN SLEEP STAGE OF SLEEP THE DECLINE OF SLEEP SLEEP DEFICIENCY SLEEP DEPRIVATION WHAT HAPPENS WHEN YOU DON'T GET ENOUGH SLEEP • https://www.nature.com/articles/497S2a • https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Understanding-Sleep#top • https://www.livescience.com/60875-sleep-deprivation-sluggish-brain-cells.html • https://www.livescience.com/52592-spooky-effects-sleep-deprivation.html • https://assets.entrepreneur.com/static/1432758512-sleepinfographic.png?_ga=2.171458272.1738420149.1543920199-1331187132.1543920199 • https://news.berkeley.edu/2017/10/17/whywesleep/ • https://www.researchgate.net/profile/Matthew_Walker18