There's no solid answer to the question of how long humans can survive without sleeping. By that point, your risk of accidents is high and it's best to stay safe by having someone else drive you to a medical facility. If you can't fall asleep and are experiencing symptoms similar to the above, contact a doctor right away. Physical illness (due to impaired immune function).Delusions (believing false information).Inability to focus on normal daily tasks.If you stay up for more than 48 hours on end, you'll likely battle intense physical and mental symptoms, including: Though lack of sleep won't kill you directly, you might feel like you're on your way out if you're experiencing severe sleep deprivation. Severe sleep deprivation can make you feel like you're in an alternate reality. How long will your body allow you to survive on short sleep? And what about complete lack of sleep - can it really kill you? CNET talked to sleep specialists to find out. Go without sleep longer than that, and you may begin to experience hallucinations, paranoia, delusions and other scary symptoms. After a night or two of poor sleep, you feel irritable, cranky, unmotivated and sluggish.Īfter a week of short slumbers, you may find yourself snapping at people, crying over nothing, battling headaches, losing focus, overeating or under-eating and scraping by on stimulants. Symptoms of sleep deprivation are progressive: The more sleep debt you rack up, the worse you feel. Gardner's 11-day experiment didn't kill him, but anyone who's experienced totalĭeprivation can likely vouch that the end feels near. Although Gardner exhibited physical, mental and emotional degeneration and experienced severe insomnia decades later, he's alive in his 70s today. You may have heard the story of Randy Gardner, the boy who once stayed awake for 11 days and 24 minutes straight - that's 264.4 hours.
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