With gross oversimplifications :
Two of the major subsystems in the human nervous system are the S / sympathetic and the P / parasympathetic nervous system. These two systems are competing for resources, with the average result being "your ancestors lived longer than their competitors".
S is specialised more for tactical short-term offensive capabilities, P is specialised more for long-term defensive capabilities.
S uses adrenaline to communicate / as a control token. One of the control tokens for S is noradrenaline. This is used to bind past memories from stressful, short-term offensive activities, so that you can learn from them. But you can't just keep binding all these experiences non-stop because that would be very negative ... so the unbinding phase of the system is when we dream ( recall experiences, without the stress ). But if the unbinding-via-dreams system is screwed up, then drugs can be administered to normalise it.
Active unbinding can also happen as a meditative exercise.
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