Hallucinations are common. Like seeing things that aren't there, just like the example of the student seeing his textbooks come to life.
Common elements include the breakdown of normal perception. Sleep - deprived people may misinterpret normal sounds or movements as something terrifying. For instance, the creaking of an old house at night might seem like a monster approaching. Another element is the isolation that often comes with sleep deprivation. If a person is alone during their sleep - deprived state, they feel more vulnerable to whatever horrors their mind conjures up. Additionally, there's often a build - up of paranoia. The more sleep - deprived someone is, the more they start to suspect that there are malevolent forces at work around them, which is a key part of the horror in these stories.
Confusion is a very common element. Like mistaking one thing for another, just like the story where someone thought their cat was a dragon. Another common element is doing everyday tasks in a really strange way. For example, making coffee wrong like my coworker did.
One common element is the loss of a sense of time. When in a sensory - deprived state, characters often can't tell if minutes or days have passed, which adds to the unease. For example, in many stories, the protagonist might think they've been trapped for a short while, but it turns out to be much longer.
Once there was a student preparing for final exams. He stayed up for days on end. As the nights passed, he started seeing strange shadows in his room. One night, he thought he saw his own doppelganger standing at the foot of his bed, grinning wickedly. He was so terrified that he could barely move. When he finally mustered the courage to turn on the light, the figure disappeared. But from that night on, every time he closed his eyes, he felt a sense of dread, as if something was lurking in the darkness waiting for him to fall asleep again.
Well, I knew a guy who worked long hours at a factory and then had to take care of his sick mother at night. With almost no sleep for weeks, one day while driving to work, he fell asleep at the wheel for a second. He woke up just in time to avoid crashing into another car. He was so shaken by that near - miss that it took him a long time to feel normal again. Lack of sleep had turned his life into a horror story.
Well, in many sleep study horror stories, there is often a sense of invasion of privacy. Having strangers watch you while you sleep can be quite unnerving. Also, technical glitches are common. For example, if the sensors stop working properly and start giving false readings, it can create a very spooky situation. Imagine being told that your heart rate is abnormal when it's actually just a malfunction.
One common element is the feeling of being unable to move. It's a very scary and helpless feeling. Another is seeing strange or menacing figures, like shadowy people or creatures. Also, there's often a sense of an evil presence in the room.
Once, my neighbor was sleep - deprived from a noisy night. In the morning, he went outside to get the newspaper. Instead of picking it up, he started having a conversation with the mailbox as if it was a person. He was asking it how its day was going and if it had any interesting news. His wife saw him and couldn't stop laughing. He was so out of it that he didn't even understand why she was laughing at first.
One scary sleep deprivation story is about a student preparing for exams. He stayed up for days. He started seeing things like shadowy figures in the corner of his room. His mind played tricks on him, and he thought his textbooks were coming alive. It was terrifying.
I was sleep - deprived during finals week. I went to the library to study and accidentally sat at the wrong table. I started using the person's stuff there thinking it was mine. When they came back, I was so confused. I just stared at them blankly for a while before realizing my mistake. It was quite embarrassing but also funny in hindsight. I was just so out of it from lack of sleep.