I've lately been experimenting with taking different amounts of vitamin D. While I have found a definite improvement in mood and energy during the day when taking vitamin D first thing in the morning, I haven't found much impact on my excessive night-owlishness, such that I still don't get enough sleep and mood/energy are not yet optimal. It occurred to me that I might be subverting the effect by spending too much time at the computer in the evenings, since the monitor emits a lot of blue light.

And lo and behold, I've discovered that you can download a free program that regulates the color of the light your monitor emits based on your latitude and the time of day. This seemed cool enough to merit sharing here.