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One idea that has gained wide acceptance is that during sleep, the body clears the brain of toxins and metabolite detritus. A new study in mice finds that awake time cleans the brain more than ...
One of the important questions in sleep research is clearly defining the sleep state. This problem arises because sleep was traditionally defined as a state of consciousness and not as a physiological state, [14] [15] thus there was no clear definition of what minimum set of events constitute sleep and distinguish it from other states of partial or no consciousness.
Two new studies indicate the importance of getting a good night's sleep — with one study saying a lack of sleep may be sabotaging the brain’s ability to keep intrusive thoughts at bay.
The brain concentration of glycogen increases during sleep, and is depleted through metabolism during wakefulness. [97] The human organism physically restores itself during sleep, occurring mostly during slow-wave sleep during which body temperature, heart rate, and brain
Prior sleep deprivation increases the percentage of time spent in slow-wave sleep (SWS). Therefore, an individual who was previously sleep deprived will have a greater chance of experiencing sleep inertia. [4] [7] Adenosine levels in the brain progressively increase with sleep deprivation, and return to normal during sleep. Upon awakening with ...
Improvement to cognitive performance caused by exercise could last for 24 hours, a new study shows. Scientists also linked getting 6 or more hours of sleep to better memory test scores the next day.
One early study into neurochemical influences on sleep and memory was conducted with cats and demonstrated that sleep deprivation increased brain protein synthesis. There is evidence that these altered levels of proteins could increase the excitability of the central nervous system, thus increasing the susceptibility of the brain to other ...
The SCN is one of many nuclei that receive nerve signals directly from the retina. Some of the others are the lateral geniculate nucleus (LGN), the superior colliculus, the basal optic system, and the pretectum: The LGN passes information about color, contrast, shape, and movement on to the visual cortex and itself signals to the SCN.