How little sleep can you get a night before you stop functioning?

[Pike]

We are talking about this in chat. I am the world's biggest lightweight and anything under than seven hours of sleep a night just kills me

[~*~Celes~*~]

I find that I can function on as many as I need to, but I burn out pretty fast :/

[Raistlin]

For one night? I can get very little sleep, almost none, and still function the next day. After no sleep, I'll start to be borderline functional halfway through the day.

Over a period of days, I can only get 2-4 hours of sleep for a few nights in a row before I desperately need more sleep.

[Peegee]

minimally I need zero to 90 minutes of rest just to not die.

my record for continuous awake times is around 60 hours at which point I started to hallucinate conversations made by 3rd party people I know

[TabbyTrap]

On work days, 3 hours will do me if I've been burning time. On most saturdays, I'm asleep til 11 or 12.
Usually around six hours otherwise.

[Shiny]

Stupidly went on 3 hours of sleep and still went to work. My brain was not functioning so did odd things all day. Luckily none of it was job costing dumb things. My body needs at least 6 hours to function properly, but my brain needs at least 8. Still I like to get at least 9-10 hours as much as possible.

[Jowy]

I can still function on five or less. I just get hopped up on caffeine and nicotine to get through the day.

[The Man]

It depends how much sleep I've had the preceding few days. If I've been very well rested then I can perform fine on anywhere from two to six hours. If I haven't, then I need at least seven hours of sleep or I will be a zombie.

I used to drink caffeinated drinks to cope with this but I stopped when it started making my sleep problems worse.

[Denmark]

coffee is amazing. i've functioned effectively on 2-3 hours sleep, over the course of a few days. I've taken exams on zero sleep, also, though i usually crashed right after.

[Shorty]

Late teens/early twenties spent all night every night drinking everclear and went on two/three hours of sleep to get up the next morning and work two jobs, six days a week. Would probably die if I tried to do it again.

Now, anything less than seven I'm grumpy and tired all day. Probably could not function on less than four.

[Jiro]

somteimes you just gotta pull an allnighter

[DMKA]

Yeah, I'm pretty much a lightweight that can't function right without at least 7 hours.

[Tigmafuzz]

I've been getting four or five hour nights every two or three days for the last... nine years? Ten? Something like that. I assume I inadvertently trained myself into that odd rhythm (in the same way that a person can train themselves to sleep two hours a night and still function simply by forcing their body to accept that as its new schedule) and I just haven't grown out of it. Although I still don't full understand how the number of hours I sleep is unaffected by whether I've been awake for two days or three. I even occasionally go four but then I have to deal with hallucinations for the last few hours before I go to sleep at a reasonable time

[Jiro]

I reset my record at something like 45 hours or something. I don't really remember. I can do alright on minimal sleep but it smurfs me up for a long while afterward. I think I'm getting too old for this trout.

[NorthernChaosGod]

If it's only for a single day, I can get as little as two hours and function reasonably well for a day. I'd need at least five hours a night to go for more than that though.