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As humans fall asleep, body activity slows down. Body temperature, heart rate, breathing rate, and energy use all decrease. Brain waves slow down. The excitatory neurotransmitter acetylcholine becomes less available in the brain. [9] Humans often maneuver to create a thermally friendly environment—for example, by curling up into a ball if cold.
In a study with 3000 patients, it was found that men and women who sleep less than 5 hours have elevated body mass index (BMI). In another study that followed about 70.000 women for 16 years, there was a significant increase in body weight in those who slept 5 hours or less compared to those who slept 7–8 hours. [1] [2] [8]
The human organism physically restores itself during sleep, occurring mostly during slow-wave sleep during which body temperature, heart rate, and brain oxygen consumption decrease. In both the brain and body, the reduced rate of metabolism enables countervailing restorative processes. [ 97 ]
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.
Past studies report that not getting enough sleep each night can increase a person’s risk for several health concerns, including brain-related conditions, such as cognitive decline and dementia.
During NREM sleep, we move through three sleep stages, with each progressively deeper than the last.As our sleep deepens, our minute ventilation continues to decrease, reducing by 13% in the second NREM stage and by 15% in the third.
It was previously believed that food comas were caused by increased blood flow to your digestive system after eating, which might divert blood flow from going to your brain, but Graber and Twilley ...
There is a scientific consensus [335] [336] [337] that currently available food derived from genetically modified crops poses no greater risk to human health than conventional food. [338] Reading in dim light causes eye strain rather than permanent damage to the eye. [203] Color blindness cannot be significantly alleviated by glasses or lenses ...