People who wake up late have a higher risk of death than normal.

This study was conducted on nearly half a million people in the UK and took place over 6 years, conducted by Kristen Knutson and colleagues at Northwestern University. The conclusion of the study was that people who often stay up late are 10% more likely to die early than those who go to bed on time.

The reason the study found is because people who often stay up late are prone to mental health disorders, obesity and other neurological diseases. In addition, because of staying up late, they often do not get enough sleep, do not exercise, often use drugs and alcoholic beverages...

"You shouldn't try to force them to wake up for the 8 a.m. shift," says Kristen Knutson. "Instead, try to align shifts with each person's body clock—some people are probably better suited to night shifts." That is, people who are night owls may have a body clock that's out of sync with the outside world.

Another study, published in 2012 in the journal Emotion, found that people who wake up late have worse moods than those who wake up early. Another study, published in the journal Psychiatry and Clinical Neurosciences, found that people who wake up late are three times more likely to develop depression than those who wake up early.

The reason is that people who wake up late often lack time to plan better, leading to a lack of confidence, which in turn leads to anxious, negative thoughts. Some scientists at the University of Toronto also confirmed that people who wake up early are often more alert, happier and their immune systems function better.

Therefore, Kristen Knutson advises that people who have difficulty waking up in the morning should have solutions to overcome this situation. For example, set a strict bedtime, do not let work pile up until late at night and try to expose to early light.