Chronic Sleep deprivation?

I think you can't go so exactly, like "what happens at the 10-11 days mark", since sleep deprivation effects depend on age, person, food, stress, drugs and other circumstances.

Here's how the Randy Garden, a 17 old year student, has described his sleep deprivation symptoms from day two to eleven. He mentions his first hallucinations at day four, and "more hallucinations" at day five.

Robert Mcdonald has not slept for 453 hours (nearly 19 days).

The longest I've gone without sleep is just a hair away from 50 hours.

I had some...interesting...experiences.

I was one week with 2-3 hours a night followed by 72 hours straight with only a two hour nap and a fifteen minute stretch where I fell asleep standing up. My thinking was pretty hazy but when adrenaline kicked in I was pretty quick on my feet. The time I fell asleep standing up I was on guard at a gate and an officer drove up in a jeep, when he demanded to know why I was so slow I quickly replied that I had trouble finding the flashlight (we had to flash a code sequence to any vehicle and they would repeat the sequence).

The first night in a real bed I was sleepwalking and talking to my roommates though I can't remember what I said or did (they told me but I've forgotten).

I once went four days without sleep, and another three on limited (two to four hours each cycle) for a total of a week with massive sleep deprevation. It was severely unpleasant.

I'm sure others' miles vary, but for me the hallucinations were quite severe and ranged from what you'd classically think of as a hallucination (items superimposed into reality) to something very peculiar--the mind actively removing objects from my vision. In other words, things that were there were, in effect, not rendered in my mind.

The other thing worth noting is that in my experience, which is pretty significant on the sleep loss front, you eat more, not less. Your body can overcome pretty considerable fatigue through increased calories, and there's an old SF axiom that with sufficient rations a soldier can carry on indefinitely (within reason, of course).

I've stayed awake maybe a couple of days at a time and would see vague things kind of out of the corner of my eye, shadows and sparks.

I got paranoid and saw smoke rising from lots of things. Normal things like a person walking by the side of the road scared me; I wondered if they were real for a second before they registered, and that was frightening.

These are from 3 days. Exams and waiting tables during other schools' graduation parties (required to work them).

When I was 16, my roommate and I decided on a particularly exciting Friday the 13th that we didn't want the day to end. So we made a bet on who could stay up the longest. With the help of Mini-thins, we both made it for seven days.

For me, the fatigue was the worst on the third day. I was yawning nearly uncontrollably and going in and out of micro-sleeps. By day four, I was sort of too tired to sleep, if that makes any sense.

I was able to keep up with my normal routine. I worked on the King Kong attraction at Universal Orlando. I drove back and forth to work, did my job, and spent the nights hanging out with friends. I had to spiel at work, and a few times I caught my spiel derailing into nonsense...probably a bit of a micro-sleep.

I never really had hallucinations exactly, but things started looking weird around day three. Sort of fuzzy around the edges, and colors were a bit brighter than usual. Friends told me later that I seemed agitated and edgy, both crankier and more hyper than usual (but some of that could have been the effects of the Mini-thins).

When it had been seven days to the hour, almost to the minute, roomie and I looked at each other. I don't remember who said it first, but we agreed to call it a draw. We giggled, hugged each other, and passed out. Like, literally both fell over onto her bed (we shared a room, and I suddenly couldn't make it to my bed), and were out before we hit the pillows. I slept for the next 24 hours, getting up only for water and bathroom. I couldn't stay awake long enough to eat. Neither of us had any ill effects beyond being tired and sort of draggy for another couple of days.