Here's another interesting finding: Adequate sleep in a very dark room is helpful. We have T-cells that kill infected cells and the binding mechanism has all been worked out. The T-cells have a receptor that is activated by neuro-hormones like adrenaline and serotonin that are elevated when you are awake. This receptor makes a substance that turns off the T-cell binding to infected cells. This means the T-cell protective mechanism works a lot more when you are asleep. Like twice as well, according to a recent peer-reviewed paper.

This T-cell attack is the first line defense against corona viruses. They tested subjects response to a mild virus placed in their noses, and the subjects with adequate sleep were three times more resistant to infection. This is huge. These neuro-hormones are also elevated by the fight/flight response to panic, so not watching TV shows that induce panic and remaining calm might help, too.

Researchers noticed a long time ago that in cancer experiments any light at all, even red light, in the animal's room during sleep increased their susceptibility to cancer. So they went to very dark rooms during the "night" period. Note that it has nothing to do with the position of the sun. Night shift workers can benefit from very good curtains or even just a piece of cardboard stuck in their window while they sleep. I just saw this study and I'm cutting some cardboard to make our bedroom very dark while we sleep.