Dr. Charles Czeisler on Light and Human Health DarkSky Massachusetts, Sept. 2019

World expert on sleep and circadian rhythms Dr. Charles Czeisler (Harvard Medical School) delivers a broad-ranging summary of the state of the science on artificial light at night and human health, including disruption of sleep cycles. This was the keynote speech at DarkSky Massachusetts’ annual meeting, Sept 2019, in Boston.