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human
ELI5 How does sleeping late harm your body

Hi first time poster here. I understand sleeping late does harm to your body but what I don't understand is if lets say I form a habit of sleeping at a specific timing (lets say 4am, and wake at 12 the next day), so I get about 8 hours of sleep every night. 

Would this affect my body somehow because this just seems to me like my circadian rhythm has changed and its akin to just living in another country with a different timezone.

Sorry if I worded it badly, English isn't my forte.
gpt
Hello! So quick disclaimer: I’m not a sleep specialist or anything but have read a few books on the subject. 

Basically your body has a natural circadian rhythm which ebbs and flows roughly with the time of day (e.g. sunset and sunrise). Sleeping through this circadian rhythm can cause your body to feel groggy (almost jet lagged) despite you getting your full 8 hours sleep. 

Lack of sleep or poor quality sleep is extremely important to avoid and has been linked to higher rates of cancer, heart disease, Alzheimer’s and dementia. 

I really recommend getting into a good sleeping habit where you sleep and wake up roughly the same time every night and morning. It will help massively with productivity. 

Also if you’re really interested in the matter, you should consider reading a book called “Why we sleep” by Mathew Walker. It’s very interesting and quite eye opening!