How long can you stay up before you can't function?

I think when I start hitting the 21 to 22 hour mark I get super sloppy. I'm at 19 hours currently and feel pretty gross not gonna lie.

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SethGreene531 · M

I can't do all nighters like when I was young.

At 1 or 2 AM you start feeling sick.

If i need to be up unusually early, some solid rest is required beforehand.

Crimsondrops · 36-40, M

@SethGreene531 I totally understand that. When I was in my teens and 20s I could do that but I'm in my mid 30s approaching late 30s now. Just can't do it.