Skip to content Brain Basics – “Understanding Sleep” – https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Understanding-SleepHuman body – “How Much Sleep Do I Need?” – https://survival-mastery.com/med/human-body/how-much-sleep-do-i-need.htmlHelp Guide – “Sleep needs” – https://www.helpguide.org/articles/sleep/sleep-needs-get-the-sleep-you-need.htmSleep education – “Healthy sleep basics” – 2015 September 21 – http://sleepeducation.org/healthysleep/healthy-sleep-basics/Sleepfoundation – “How much sleep do we really need?” – https://www.sleepfoundation.org/articles/how-much-sleep-do-we-really-needHelp Guide – “Sleep needs” – https://www.helpguide.org/articles/sleep/sleep-needs-get-the-sleep-you-need.htmSleepfoundation – “Healthy sleep tips” – https://www.sleepfoundation.org/articles/healthy-sleep-tipsHealthline – 17 Proven Tips to Sleep Better at Night – https://www.healthline.com/nutrition/17-tips-to-sleep-better#4.-Reduce-irregular-or-long-daytime-napsThe Science of Sleep – “Understanding What Happens When You Sleep” – https://www.hopkinsmedicine.org/health/wellness-and-prevention/the-science-of-sleep-understanding-what-happens-when-you-sleepClaire Maldarelli, December 14, 2018 – “Why do people need to sleep?” – https://www.popsci.com/why-we-need-sleep/Brain Basics – “Understanding Sleep”- https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Understanding-SleepMichael Finkel, August 2018 – “We Sleep, Our Mind Goes on an Amazing Journey” – https://www.nationalgeographic.com/magazine/2018/08/science-of-sleep/Healthline – “How Much Deep, Light, and REM Sleep Do You Need? – https://www.healthline.com/health/how-much-deep-sleep-do-you-need#stagesSleepCycle – “How sleep cycle works” – https://www.sleepcycle.com/how-sleep-cycle-works/Jennifer Christensen on Oct 16, 2013 – “Summary of sleep cycles” – https://www.alaskasleep.com/blog/summary-of-sleep-cycles 