Wake up at sunrise, go to bed at sunset. Anything else is going to cause problems.. or you are simply a night owl, which is ok. The key is to go outside, get some natural light and sun on your skin. Most of us reading this are vitamin D deficient year after year. Covid has had an advantage on anyone lacking proper vitamin levels.
At winter time it get really dark really fast and usually there is only sunlight for a couple of hours per day.