One of the main reasons is that we have symbolic thinking. We are the only know kind of animal that a word, a symbol or a thought acts exactly as the real object/situation and triggers the same as the original stimuli.
When we are on bed and we think in a perceived danger (for example something that may happen tomorrow) then our body react the same way as we were actually present in a real dangerous situation.
It doesn’t matter how comfortable and safe we are on the bed, the though will trigger a real alert status in our body, and we are not wired to sleep if we are in a situation where our safety is risked.
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