Permanent Daylight Saving Time: The Good, the Bad, and the Ugly

Roger Seheult, MD of MedCram explains the ways permanent daylight saving time would affect health. See all Dr. Seheult's videos at: https://www.medcram.com/ (This video was recorded on July 18th, 2026) Roger Seheult, MD is the co-founder and lead professor at https://www.medcram.com/ He is Board Certified in Internal Medicine, Pulmonary Disease, Critical Care, and Sleep Medicine and an Associate Professor at the University of California, Riverside School of Medicine. LINKS / REFERENCES: Contacting U.S. Senators (United States Senate) | https://www.senate.gov/senators/senators-contact.htm Shedding Light on Daylight Saving Time (JP Morgan Chase) | https://www.jpmorganchase.com/institute/all-topics/local-economic-development/jpmc-institute-daylight-savings-report OPINION: Stick that extra hour where the sun don't shine (Nevada Independent) | https://thenevadaindependent.com/article/opinion-stick-that-extra-hour-where-the-sun-dont-shine Impact of daylight saving time on physical activity patterns (Nature Health) | https://www.nature.com/articles/s44360-026-00115-z A phase response curve to single bright light pulses in human subjects (The Journal of physiology) | https://pmc.ncbi.nlm.nih.gov/articles/PMC2342968/ The effects of post-awakening light exposure on the cortisol awakening response in healthy male individuals (Psychoneuroendocrinology) | https://pubmed.ncbi.nlm.nih.gov/31220690/ Bright Light for Weight Loss: Results of a Controlled Crossover Trial (Obesity facts) | https://pmc.ncbi.nlm.nih.gov/articles/PMC5644670/ Timing and intensity of light correlate with body weight in adults (PloS one) |https://pubmed.ncbi.nlm.nih.gov/24694994/ Ambient Light Exposure and Changes in Obesity Parameters: A Longitudinal Study of the HEIJO-KYO Cohort (The Journal of clinical endocrinology and metabolism) | https://pubmed.ncbi.nlm.nih.gov/27383113/ Dawn simulation and bright light in the treatment of SAD: a controlled study (Biological psychiatry) | https://pubmed.ncbi.nlm.nih.gov/11513820/ Is dawn simulation effective in ameliorating the difficulty awakening in seasonal affective disorder associated with hypersomnia? (Journal of affective disorders) | https://pubmed.ncbi.nlm.nih.gov/12103471/ Morning Sleep Inertia in Alertness and Performance: Effect of Cognitive Domain and White Light Conditions (PloS one) | https://pmc.ncbi.nlm.nih.gov/articles/PMC3832615/ Latitude of Residence and Position in Time Zone are Predictors of Cancer Incidence, Cancer Mo