The most caffeine I ever ingested in a 24 hour period?
I had decided to pull an all-nighter (something I rarely did) studying for an exam in Law School, so when I went to dinner at IHOP around 7PM, I ordered my usual bottomless glass of Iced Tea...AND their bottomless pot of coffee. Over the course of a couple of hours, I finished the pot of coffee and started another while downing several large glasses of tea.
My signal to stop (besides running to the john every 15 minutes)?
The continuous hum I was hearing...that lasted 'till 5AM.
Now, that kept me up and alert for some time...but it wasn't the longest I ever went without sleep.
I don't sleep much- on average, between 4-6 hours since I was a kid. Mostly 4 hours when I was under 35, mostly 6 hours since then.
But in my freshman year of college, I had a severe bout of insomnia. I was up for 65 hours straight. When I finally was able to drop off, I slept for 20 hours straight...
And awoke in the middle of a party my (oh so empathetic) roomie was throwing.