Experts have linked disruption of an individual’s natural sleep-wake cycle with reduced longevity and demonstrated it can actually cause heart and kidney disease when internal biological clocks in hamsters are out of sync with external rhythm regulators (i.e. light/dark); the heart becomes damaged and enlarged (cardiomyopathy) and the kidney tubules sustain significant scarring.
In 2007, researchers at the San Francisco VA Medical Centre (SFVAMC) attributed cognitive decline in elderly women to interrupted or fitful sleep when they were younger, in a study that appeared in the July issue of Neurology. Though they said it is not how long they sleep but how well, they speculated that the first and most likely reason is that whatever neurodegenerative condition such as Alzheimer’s disease, is starting to cause cognitive decline, may also affect areas of the brain that govern sleep.
While factors entirely, such as brain inflammation or genetic changes, might cause both cognitive decline and sleep disturbance at the same time, but the fact that when you are woken up from sleep in the middle of the night, it may leave you thinking less clearly, has great implications. This is very applicable to many categories of people, including medical doctors on call, emergency personnel and even parents. According to the expert in a study, published in the August issue of the Journal of Biological Rhythms, sleep inertia, the period of grogginess and impaired cognitive performance experienced upon awakening, was nearly four times stronger when people were awoken during the middle of their “biological night” (a period of normal night of sleep) compared to their biological day.
The feeling was almost twice as strong during the person’s biological morning, the wake-up period following a normal night of sleep. People also showed the least thinking impairment after awakening during the middle of the biological day. The lead author, Frank A.J.L. Scheer, a neuroscientist in Brigham and Women’s Hospital Division of Sleep Medicine, in a release from the hospital declared also that, “This is especially important, considering that already following awakening during the morning, the cognitive impairment can be more detrimental than staying awake all night. This has been shown to be comparable to the effects of alcoholic
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