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This has been known and backed up by studies for ages, but I guess more studies backing it up don’t hurt.
Define “irregular.” mine is regular as in, consistently the same.
It’s literally explained the first words of the article. You don’t even have to read the whole thing.
It would have been way easier and quicker for you to just click on the article which explains the answer to this question in detail. Why did you type out a comment instead?