To interject some science into the anecdotes, if the timing of your sleep impacts your daily life (i.e. you may have a "sleep disorder") the following may be of

To interject some science into the anecdotes, if the timing of your sleep impacts your daily life (i.e. you may have a "sleep disorder") the following may be of interest: * General category of "Circadian rhythm sleep disorders": https://en.wikipedia.org/wiki/Circadian_rhythm_sleep_disorder https://en.wikipedia.org/wiki/Circadian_rhythm_sleep_disorde... * "Night owl" a.k.a. "Delayed sleep phase disorder" (often related to teens & adults) : https://en.wikipedia.org/wiki/Delayed_sleep_phase_disorder https://en.wikipedia.org/wiki/Delayed_sleep_phase_disorder * Extremely early riser a.k.a. "Advanced Sleep Phase Disorder" (often related to the older people) : https://en.wikipedia.org/wiki/Advanced_sleep_phase_disorder https://en.wikipedia.org/wiki/Advanced_sleep_phase_disorder * Sleep/wake cycle "a day" significantly longer than 24 hours: "Non-24-hour sleep–wake disorder" : https://en.wikipedia.org/wiki/Non-24-hour_sleep%E2%80%93wake_disorder https://en.wikipedia.org/wiki/Non-24-hour_sleep%E2%80%93wake... Note that in additional to issues directly connected to sleep disorders, there are often significant impacts from cultural/societal attitudes to when individuals sleep that lead to secondary effects (e.g. shame, guilt, depression)--particularly for people who are unaware that sleep disorders exist and have not yet been diagnosed. (Similar dynamics affect people with, for example, executive function-related disorders such as ADHD/ADD. Additionally, interactions between sleep disorders & ADHD/ADD mean that aids such as supplementary Melatonin need to be taken at different times and/or e.g. smaller doses.) I am not a doctor, nor a sleep specialist but I do believe people (& their families) who are affected by sleep disorders deserve to be informed and not subjected to the feeling that their inability to sleep at a societally mandated time is a character flaw or evidence of them "just not trying hard enough".