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  1. Oct 3, 2022 · Seeing things just as you fall asleep or wake up is common and usually nothing to worry about. You might see a moving object or a person, but it seems a little dreamy.

    • Alia Hoyt
    • Skin Crawling. Ever felt like bugs were crawling all over you, with nary an insect in sight? The feeling that your skin is crawling is a form of tactile (touch) hallucination.
    • Hearing Voices. People who hear sounds, such as voices, that aren't actually there are dealing with auditory verbal hallucinations (AVH). Such voices can run the gamut from positive to negative and everywhere in between.
    • Smelling an Odor. Olfactory hallucinations (also called "phantosmia") occur when a person smells something that isn't there. Most of the time, the odors are nasty, like feces, smoke, vomit or urine.
    • Seeing Lights or Beings. Visual hallucinations include seeing people, lights or patterns that no one else can spot. This is the most common type of hallucination for dementia patients, although people with delirium (disturbance of consciousness) also experience it.
  2. May 30, 2019 · Observing the waterfall illusion, we can notice another interesting effect – things can appear to move without seeming to change in position. For example, in the video of the waterfall...

  3. Jan 13, 2024 · Discover the intriguing science behind nocturnal vision and explore why seeing at night can be challenging. Understand the factors that affect our ability to see in low light conditions and uncover the fascinating adaptations that help nocturnal animals navigate the darkness.

  4. Jun 22, 2020 · Night owls, or people who like to go to bed really late and wake up later in the morning, are more likely to see the dress as black and blue. Larks, a.k.a. early risers, are more likely to...

    • Brian Resnick
  5. Aug 31, 2021 · Illusions have been used throughout history to amaze, entertain, trick and even scare us. But they are also a mind-boggling window into how our brain works.

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  7. If we could see in the Infrared part of the spectrum, it would be very effective at night, but blinding during the day. Humans instinctively seek shelter during the night, and harnessed fire long enough ago to evolve preferences for daytime activity.