"Much of the science on the link between inconsistent sleep and poor health is based on observational studies, which can't prove cause and effect. Their results are also often restricted by various limitations (including if the study was performed on a small number of people, or on people of only certain ages, ethnicities or occupations). It's also difficult to accurately track people's sleep patterns over months or years, and some studies define sleep consistency in different ways."
"Those who tend to deviate most from a consistent sleep schedule seem to be at higher risk of certain health conditions such as cardiovascular disease, obesity, mental health issues like depression and anxiety, and dementia. In a 2020 study, researchers analyzed the sleep patterns of nearly 2,000 adults aged 45 to 84 in the United States. They concluded that those with the most irregular sleep schedules were more than twice as likely to develop cardiovascular disease than those with more regular sleep patterns."
Sleep consistency means keeping the same bedtime and wake-up time within about 30 minutes every day, including weekends. Many adults in the United States lack such a consistent schedule. Observational research links irregular sleep timing to higher risks of cardiovascular disease, obesity, depression, anxiety and dementia, though observational studies cannot prove causation and often have limitations. Tracking sleep accurately over long periods can be difficult, and studies use varying definitions of consistency. A 2020 analysis of nearly 2,000 adults aged 45 to 84 found that the most irregular sleepers were more than twice as likely to develop cardiovascular disease.
Read at Boston.com
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