The research was conducted by scientists at Peking University and Army Medical University in China. Quoted from Female First, on Tuesday, August 5, 2025, the study said that sleep is not only about its duration, but also about its sleep and rhythm which determines the health of the body.
"So far, many studies have focused more on sleep duration, whereas other characteristics such as sleep and sleep rhythm are also very important to analyze," the researchers wrote in their report.
The researchers say the habit of sleeping late at night has a significant connection with health problems both physically and psychologically. Some of them are heart disease disorders, metabolic disorders, to various mental health problems.
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Even if it is done occasionally, sleeping past midnight can disrupt sleep cycles in the long term. Sleep experts and neurologs in the United States, Dr. Chris Winter, explains that sleeping past 12 p.m. can make a person lose a deep sleep phase that is important for body regeneration.
Deep sleep or slow wave sleep occurs at most in the first two hours since someone sleeps. So, if you usually sleep at 10 pm, the deep sleep phase occurs between 10 and 12,' said Chris.
If you sleep after midnight, it means this important phase can be missed. Whereas in that phase the body secretes growth hormones and other important chemicals. If this phase is disturbed, stress hormones such as cortisols can increase," he added.
The increase in cortisol not only has an impact on mood, but also disrupts the stability of blood sugar and body metabolism as a whole. Therefore, this habit should be stopped immediately and start to sleep on time with a minimum duration of 7 hours for better body health.
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