When a person does not get enough food, sleep and/or drinks too much alcohol their brain starts playing tricks on them.........I myself, while waking from a nap, saw a raccoon hula hooping on one of my tables; of course it wasn't real, but it'll be cute tough; It's what is called lucid dreaming, you know that you're awake but also dreaming. The image I saw was vivid. There are also audio hallucinations where a person imagines sound.
One of my friends thought she saw a ghost, when she woke up one night, of course it wasn't real, Let's say it's like your brain is producing an image and seemly casting the image on to the real world,like it was from a movie projector.And she herself was only 1/2 asleep.
What about fasting? There are church people who fast and say they saw the actual devil or even demons, those aren't real either; In fact you can tell your brain "I don't want to see that, I want to see a beautiful lady instead." It's just an illusion no matter how vivid.
It's possible to fast for 40 days and 40 nights, I wouldn't try it myself, it's very dangerous. They still have to drink liquids, if not your urine starts to thicken after 3 days,very thick, and have to go to the doctor. After 5-7 days the person is dead, even tough some people survive after 21 days.Best not to fast more than 2-3 days but not with out water or other liquids.
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