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How does the body experience free-fall during a hypnic jerk

Today I learned that a sudden jerk that you sometimes experience when you are just about to fall asleep due to a sense of free-fall or weightlessness is called a hypnic jerk. If, while sleeping, I ...
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Can we smell in dreams?

I'm interested in whether people can smell in their dreams. Do people really experience smell in their dreams? For example, if I dream of smelling a flower, will I feel the smell, too? Is there any ...