How long can a person live without food and water or air?

How Long Can You Go Without Sleep?

Any new parent can verify it's possible to go days without sleeping. Yet, it's an essential process. While scientists are still unraveling the mysteries of sleep, it's known to play roles in memory formation, tissue repair, and hormone synthesis. Lack of sleep (called agrypnia) leads to decreased concentration and reaction time, diminished mental processes, reduced motivation, and altered perception.