Happy Diwali! Happy Flashback Saturday! I thought it would be worth reposting what I wrote three years ago about lights in the coming of winter. I noticed many of us are putting up Christmas lights early–fantastic! We need ’em. Trees, too? Sure! Even if no one beyond your pod can visit inside your house–and they should not!– they can drive by and look… or you could take turns doing a Zoom tour of the inside for family and friends. Be creative. Stay safe! Be grateful that you are all still here.
There is a light at the end of the tunnel, even though it’s still dim. Here’s my post, from December 20, 2017.
I highlighted a recent sentiment that Christmas lights make everything better. This is no accident. Tomorrow is the winter solstice, the shortest day of the year in the northern hemisphere. Our body clocks can’t wait for that turning of the tide and, over centuries, our cultures have created one tradition after another to add lights which stave off that darkness. That desire for more light is built into us at the core, even at the cellular levels, within our circadian rhythms.
Hall, Rosbash, and Young won the 2017 Nobel Prize in Physiology and Medicine for studying the phenomenon of circadian rhythms. The basic notion of a circadian cycle is one tied to a 24-hour biological clock, a circuit fundamentally tied to the length of a day, split between sun and darkness. Life cycles, for everything from plants to fruit flies to human beings, have adapted to that 24-hour pattern. Scientists have known for years that key processes that regulate sleep, hormone production, metabolism, and behavior are linked to these patterns. The Nobel scientists figured out why.