When working in a dark room, turning the brightness down on a display, even to the lowest setting, can still be irritating to your eyes. Even if your eyes can handle it, the light from your screen can be annoying to those around you.
By installing the app from Pixio, you're able to switch to night viewing by clicking on the icon in your Mac's menu bar.
Users are able to customize the overall look and feel of the night mode, including switching between a monochrome or tinted-colors look. In addition to adjusting the color scheme, you're also able to have the app hide your desktop wallpaper, and disable any shadows found throughout OS X.
You can download Tranquility from Pixio by visiting the company's Web site.