Hi. It is well known that we lose consciousness when we fell asleep, as an individual, we stop being conscious of external and internal stimuli, at least, in most cases. In no-dream sleep, brain activity should be one that can unconsciously manage internal and external stimuli, and should not experiment significant changes in blood flow to the brain, as if we were to observe with fMRI, nearly no BOLD signal would appear. Am I right about this last thing? If not, please reply. Thanks to all.
"...over the course of the first hour or so of sleep, the brain progresses through a series of stages during which brain waves slow down. This period of slow wave sleep is accompanied by relaxation of the muscles and the eyes. Heart rate, blood pressure, and body temperature all fall."1.4.2012 BrainFacts
s. Béatrice Marianne Ewalds-Kvist Huge thanks to you! I think the source you cited will be really helpful for me in the future.
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