Worst I've been awake was 3 days, with no sleep at all.

Sometimes when I'm sick with a fever something happens in my brain so when I get closer to falling asleep, it is like I need to wake up and sometimes I even flail around.

Before that, for a while, I woke up at falling asleep, like a jolt, and I was wide awake again. It was like instinctively I feared sleep. I don't know if the fear was real or if it was just an explanation for not being able to pass the moment of falling asleep. It's kind of like a myoclonic jerk, but of the mind, like somehow the falling asleep is really hard. Not because I'm not sleepy, because I was, but because my sleep switch wasn't working.

I was more lucky, because I could finally fall asleep after several frustrating and scary tries. But after I finally fell asleep, I was fine.

I'm not sure what caused it in the case when I was actually physically well, because I wasn't more stressed than usual. I tried to toughen it out, like telling myself it was fine falling asleep. But then when I was going to sleep, I still sort of woke up, because when I was that close to sleep I had no idea where I was or anything, so I could no longer tell myself It was OK going to sleep. But after repeating it many times, telling myself it is fine to sleep, I finally could.

These days I have sleep meds and I'm very spoiled like that.