A daily routine and daily exposure to sunlight help regulate sleep. Research backs this up and I see it in myself. My best sleeps come after days when I get up and out and do the things I do at the usual time.
Last night my sleep went off the rails, and I’m convinced the problem was at least partly related to light. Let me explain.
It happens every year in the spring: someone writes in to The Savvy Insomniac complaining of an inexplicable onset of insomnia. No stress is involved, no abrupt change in circumstances.
If you find yourself experiencing insomnia at about this time every year, the problem may have to do with lengthening days. The solution may lie in reducing your exposure to sunlight.