Getting enough sleep is perhaps even more important than getting enough sun. Without the need to sleep, we’d certainly have more time to do a lot of other things, but the consequences of not sleeping would be detrimental.
A day without sleep
Everything is funny after not sleeping for a day, most of the things will be able to make you laugh hard. Your sex drive will increase because when you lack sleep, your brain increases the dopamine levels.
Two days without sleep
After a day, the positivity decreases, you’re slowly becoming irritated and moody. Your behavior will get more impulsive, similar to that when you’re drunk. Within the day two, some of the bodily functions will start to shut. The ability to metabolize glucose is gone, leaving the body without energy. Impaired judgment, nausea, and impaired speech will make you look drunk to almost everyone.
Three days without sleep
All the fun is gone. Now you’ll start hallucinating, either auditory or visually. This is because of lack of the REM phase. Scientists have found that even if you had enough sleep but without the REM phase, you’d still die. After three awake days, a person can’t function normally.
The longest recorded wake time was around 11 days, or 264 hours to be specific.
Source: Asap Science