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A night owl or an evening person with a late sleep-wake cycle could be at a higher risk of cognitive decline with age compared to an early bird or a morning person, a study has found. Chronotype refers to one's sleep-wake type or times during the day when one naturally tends to be awake and asleep. A 'night owl' chronotype is said to have a later sleep-wake cycle, compared to an 'early bird' or a 'lark'. "Are you an early bird or a night owl? It's hard to adjust what your biological clock your so-called chronotype is, but you can adjust your life to it as best you can," study author Ana Wenzler, from the University Medical Center Groningen, the Netherlands, said. Analysing the performance of about 23,800 participants on a cognitive test over a period of 10 years, the study found that evening people decline cognitively faster than morning people. The findings have been published in The Journal of Prevention of Alzheimer's Disease. "Unhealthy behaviour such as smoking, drinking a
People with poor objective sleep quality exhibit unfavourable physical health indicators, particularly elevated blood pressure, a study has found. Objective sleep quality consists not only of the total sleep duration, but also the amount of the different sleep stages, the duration of wake period, and the frequency of awakenings. Researchers from the University of Tsukuba in Japan conducted a comprehensive study involving 100 adults aged 3059 years by employing electroencephalogram (EEG) measurements to assess sleep quality for five nights at the participants' homes. Electroencephalography is a method to record an electrogram of the spontaneous electrical activity of the brain. Additionally, detailed health examinations were conducted at a health care facility in Tokyo. Ten sleep parameters derived from the EEG data collected during the five-night home study were used to categorise participants into three groupsnamely, the good sleep group (comprising 39 participants), the intermed