how long can you survive without sleep
40 FACTS ABOUT SLEEP YOU PROBABLY DIDN'T KNOW... -The record for the longest period without sleep is 18 days, 21 hours, 40 minutes during a rocking chair marathon. The record holder reported hallucinations, paranoia, blurred vision, slurred speech and memory and concentration lapses. - It's impossible to tell if someone is really awake without close medical supervision.