Saving my eyes with f.lux

I've recently been staying up late and feeling tired even after getting a normal length of sleep. Recently I switched to my new laptop for everyday use, and a couple days ago I noticed that the screen is really bright at night. Then I remembered that since this laptop is new, there's a variety of programs on my desktop that I haven't installed here. One of those is f.lux, which changes the color temperature of the screen toward red at night. I installed that and now my eyes feel much better - hopefully my sleep will also improve.