Sleep pattern influence on lifespan

As long as your sleep duration is optimal (about 7-9 hours a day <ref>https://pubmed.ncbi.nlm.nih.gov/17625932/</ref>), you can be morning type or evening type person without negative influence on lifespan. Though try to avoid extreme evening type.
In this article, "owls" mean people who wake up late and go to bed late. "Larks" are people who wake up early and go to bed early. Both owls and larks can have optimal sleep duration, the distinction is just about their chronotype.

May be it's bad to go to bed very late:
https://pubmed.ncbi.nlm.nih.gov/29642757/
9% of the latest owls had RR 1.10 (1.02 - 1.18) which corresponds to minus 0.9 (0.2 - 1.5) years of life. Moderate owls, moderate larks and the earliest larks (27%) didn't have statistically significant difference in lifespan compared to each other (pp.5-6).
Though judging by other tables perhaps it's a little bit better to be a moderate lark.
Authors adjusted for sleep duration.
Minus of the study - the chronotype was determined simply by the questionnaire.

Dying curves according to chronotype:
https://pubmed.ncbi.nlm.nih.gov/24131152/
9% of the latest owls have higher mortality. Moderate owls, moderate larks, earliest larks almost don't differ (though might be moderate larks live a little bit longer). Again, sleep pattern was estimated using questionnaires.