Sleep and Stress
You start off shallow, gradually sleep your way down to slow wave sleep, followed by REM, then back up again, and then repeat the whole cycle about every ninety minutes. (Location 3769)
During slow wave sleep: regions involved in controlling muscle movement show decreased metabolism. Regions involved in the consolidation and retrieval of memories don’t have much of a decrease—but the pathways that bring information to and from those regions shut down dramatically, isolating them. Deep slow wave sleep is when energy restoration occurs. (Location 3776)
Sleep deprivation is not a great predictor of the total amount you will ultimately sleep, but it is a good predictor of how much slow wave sleep there’ll be. (Location 3782)
During REM sleep: Parts of the brain that regulate muscle movement, brain stem regions—all increase their metabolic rate. In a part of the brain called the Limbic System, which is involved in emotion, there is an increase as well. The same for areas involved in memory and sensory processing. (Location 3786)
The Frontal Cortex does all this disciplining of you by inhibiting that frothy, emotional limbic system. During REM sleep, metabolism in the frontal cortex goes way down, disinhibiting the limbic system to come up with the most outlandish ideas. That's why dreams are dreamlike—illogical, nonsequential, hyperemotional. (Location 3797)
If you skip a night’s sleep, when you finally get to sleep the next night, you have more REM sleep than normal, suggesting that you’ve built up a real deficit of dreaming. (Location 3810)
REM sleep also seems to play roles in the formation of new memories, the consolidation of information from the previous day — even information that became less accessible to you while awake over the course of the day. (Location 3822)
⇒ Stress and Memory
Lots of REM sleep during the night predicts better consolidation of emotional information from the day before, while lots of stage 2 sleep predicts better consolidation of a motor task, and a combination of lots of REM and slow wave sleep predicts better retention of perceptual information. (Location 3829)
Patterns of activation of hippocampal neurons that occur during learning are then repeated when the animal is sleeping. (Location 3838)
==Sleep deeply, and you turn off Glucocorticoids secretion.== An hour before you wake up, levels of CRH, ACTH, and glucocorticoids begin to rise. This is not just because merely rousing from slumber is a mini-stressor, requiring mobilization of some energy, but because those rising stress hormone levels play a role in terminating sleep. (Location 3857)
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Tags: neuroscience science
Superlink: 050 🧠Neuroscience 051 ☣Neurobiology
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Erstellt: 05-04-26 10:00