In short, we don’t know. It’s a very interesting area because some people do have the ability to shut off pain or fall asleep at will, while others need someone to tell them that they can do it before they are able to while others can never ignore pain or fall asleep without drugs.
There is research being done to try and figure out why this might be and to discover how much of the experience of pain is for surviving in the moment, learning to survive something similar in the future, and social to tell others that you need help.
Sleep is even more mysterious. There still isn’t a clear idea of what sleep is and why it is necessary. We do know that not being able to sleep is often dangerous but again some people do not sleep at all and seem to be fine.
There is a lot we don’t know about our own bodies, mostly because they are very complicated things.
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