We’re all sensitive to light at night, but some are much, much more sensitive than others

by  on November 5, 2019 in Clocks in the Spotlight

Image credit: Olivia Walch (Twitter: @OliviaWalch; website: www.oliviawalch.com) 

Humans evolved in an environment with only very bright (sun) or very dim (moon or fire) sources of light. Today, artificial lighting enables us to spend hours per day at intermediate light levels. Our recent study shows that the response of the circadian system (the ‘body clock’) to light across this intermediate range is hugely different between people.

These differences may help to explain individual differences in body clock timing, as well as how we adapt when our clock is challenged.  The body clock controls the timing of many systems in our body, including our metabolism, sleep, and how alert we feel.

Read more at:

We’re all sensitive to light at night, but some are much, much more sensitive than others

High sensitivity and interindividual variability in the response of the human circadian system to evening light