Living in a giant vacuum cleaner: the reality of sleeping in orbit

Space · Published 8 October 2026 Swipe more like this →

In short: On the International Space Station, astronauts experience 15 dawns every 24 hours. To prevent permanent jet lag, they must fight their evolutionary instincts by adhering to strict schedules, all while navigating a noisy, potentially dangerous environment where even a lack of airflow can be fatal.

Maintaining a sense of time is a critical challenge for crews aboard the International Space Station. Because the station orbits the Earth so rapidly, residents witness 15 sunrises every single day. To prevent the crew from living in a state of permanent jet lag, they must follow fixed schedules that align with the 24-hour circadian rhythms hard-wired into the human brain by millions of years of evolution. This adherence to a regular routine is necessary because human biology is naturally tuned to a specific daily cycle. Without such structure, the crew's biological clocks would be constantly disrupted by the rapid orbital speed.

Sleeping in microgravity presents unique physiological and environmental hazards. Astronauts must secure their sleeping bags to walls to avoid drifting into equipment. Crucially, they must sleep near ventilator fans; because warm air does not rise in space, a lack of airflow can cause a bubble of exhaled carbon dioxide to form around a sleeping astronaut's head, leading to oxygen starvation and splitting headaches. Selecting an appropriate sleeping spot is therefore a vital safety precaution. If ventilation is inadequate, the buildup of carbon dioxide can become a life-threatening issue for the sleeping astronaut.

The auditory environment is equally intense. The constant operation of life-support systems and air filters creates a persistent background noise that some crew members compare to living inside a giant vacuum cleaner. While some astronauts rely on earplugs, many eventually acclimatize to the sound, finding the noise of the systems dedicated to their survival to be strangely reassuring. This mechanical drone is a constant presence throughout the station. Many residents eventually find that the sound of these life-sustaining machines provides a sense of security.

Beyond daily survival, the station serves as a vital laboratory for long-duration missions. For instance, during Expedition 44, Scott Kelly undertook a year-long mission to gather biomedical data essential for planning future human journeys to Mars. Such research is fundamental to understanding how long-term spaceflight affects the human body. These findings will help scientists prepare for the complexities of traveling to the Red Planet.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• Why astronauts sleep in a giant vacuum cleaner
• Living on the International Space Station means experiencing fifteen dawns every single day
• Sleeping in space is less about comfort and more about survival
• To survive space, humans must fight their own biology
• Living in a house that sees 16 sunsets every single day
• How astronauts maintain their connection to Earth while orbiting 250 miles above
• The invisible chores that keep the International Space Station running
• Four astronauts prepare to return home after their mission on the space station.
• An astronaut records a music video from the International Space Station to celebrate connection
• How International Space Station Missions Pave the Way for Future Human Exploration Beyond Earth
• A weightless laboratory orbiting 400 kilometers above our planet
• A six-month journey begins as new crew reaches the International Space Station

More in Space stations · More in Space · Latest · A–Z · All topics