Deadly heart attacks are more common on a Monday

I've read a bit into this subject before; Matthew Walker's book 'Why We Sleep'[0] discusses it at length.

A lot of it boils down to blood pressure. High blood pressure is a serious contributing factor to cardiovascular incidents (as well as a slew of other negative health risks), and getting a good night's sleep will help keep blood pressure down. This is also why the amount of heart attacks are up around 24% after daylight savings[1]; an hour less sleep means higher blood pressure means higher risk of heart attack (relative to any other 'normal' day).

I can definitely see how the same logic could apply to Mondays. Less sleep, more stress = higher blood pressure = higher risk of heart attacks.

[0] https://www.goodreads.com/book/show/34466963-why-we-sleep

[1] https://pubmed.ncbi.nlm.nih.gov/18971502/

The important consideration here is that these people are on the cusp of death already, and this is typically just the straw that broke the camel's back. You don't get a heart attack from one bad night of sleep, of course, unless there are significant underlying conditions.

On the flip side, isn't it also likely that repeating the same stressful behavior pattern over years (decades?) results in this outcome?

However, parsing signal from noise does seem a very difficult proposition.