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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.
Modern humans often find themselves desynchronized from their internal circadian clock, due to the requirements of work (especially night shifts), long-distance travel, and the influence of universal indoor lighting. [31] Even if they have sleep debt, or feel sleepy, people can have difficulty staying asleep at the peak of their circadian cycle.
Other sleep behaviors, such as non-rapid eye movement sleep and rapid eye movement sleep, and the impact sleep has on "synaptic pruning" and the creation of memories during a human's lifespan are also covered. [14] NREM and REM are further explained by Walker to be the two sleeping basics, with 5 cycles present in a person's good night sleep. [11]
The sleep study was only conducted over a single night, so the data on sleep duration may not represent long-term sleep patterns. Blood pressure decreases by 10% at the time of sleep onset, and ...
Tonic activity of the pharyngeal dilator muscles of the upper airway decreases during the NREM sleep, contributing to the increased resistance, which is reflected in increased esophageal pressure swings during sleep. The other ventilatory muscles compensate for the increased resistance, and so the airflow decreases much less than the increase ...
Also: “Temperature is regulated near the same brain real estate that handles sleep,” adds W. Chris Winter, M.D., a neurologist and sleep specialist in Charlottesville, VA and member of ...
Chronic sleep deprivation (less than 8 hours of sleep) is associated with an increase in body mass index (BMI) and obesity. 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 ...
Getting a good night's sleep can be a little more challenging amid the hype of the holidays. With changes in routine, diet and potentially time zones, quality sleep could be difficult to come by ...