8. Sleep Disturbances
Living in space means saying goodbye to Earth’s familiar day-night rhythm. Constant artificial lighting and the absence of natural sunlight can disrupt astronauts’ circadian rhythms, often leading to poor sleep quality and persistent fatigue. Many astronauts struggle to get restful sleep on missions, which can affect mood, alertness, and overall performance. Researchers continue to seek solutions for improving sleep in space. [Source: NASA]