This color scheme uses more warm and lower brightness colors, which should be easy on your eyes. (It may look a little bit yellow (or dirty), this is intended.)

Contains 3 themes (Default, Dimmed and Lighter) that based on the same color scheme. Choose the one that fits your screen setting and your preference.

Recommended fonts: Fira Mono, Input (the font of the screenshot above) or Hack.

I'll also recommend the f.lux app.

Looking for the Atom theme? It's here