4. Correct lighting
The lighting at the space station impacts the circadian rhythms of the astronauts. Fluorescent lights emit blue light and hence they are not used in spaceships or space stations. Instead, they use LED lights that can change their colour and intensity. They reduce the blue light at night and increase it in the daytime. This improves the astronauts’ performance. If you already don’t have any, you can install warm white LED lights in your home as they have almost no impact on melatonin.