Out-of-body experiences
Sleep paralysis can sometimes make us feel like we're floating outside our body. The out-of-body experience can reliably be reproduced in the laboratory by disrupting the temporo-parietal junction in the brain. This region helps build a body image based on inputs it receives from the senses. The area is usually turned off during REM sleep.
In sleep paralysis, there is no feedback from the body telling the brain how to build the body image, resulting in out-of-body hallucinations such as seeing your body float in the air or sink deep into the bed.
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