- Normal and Abnormal Sleep in the Elderly
www.ncbi.nlm.nih.gov/pmc/articles/PMC3142094/ - Aging & Sleep Information – National Sleep Foundation
www.sleepfoundation.org/articles/aging-and-sleep - Tips for Sleeping Better as You Get Older
www.webmd.com/sleep-disorders/guide/aging-affects-sleep - Sleep Disorders in the Elderly
www.healthline.com/health/sleep/sleep-disorders-in-the-elderly - 6 Reasons Behind an Elderly’s Sleeping Too Much | New Health Advisor
www.newhealthadvisor.com/Elderly-Sleeping-Too-Much.html