“Waking and dreaming are two states of consciousness, with differences that depend on chemistry.”
“We can safely conclude that REM sleep dreaming is mediated by acetylcholine when noradrenaline and serotonin are at very low levels.”
“Here is a sample hypothesis: we can trigger memory fragments with acetylcholine but cannot make new ones without noradrenaline and serotonin.”
“We still don’t understand why the brain self-activates during sleep, yet evidence suggests that it is certainly not only to replay previous experience.”
