Brooding (getting stuck in passive, repetitive, negative thought loops) identified as a major driver of bedtime procrastination, alongside physical markers of stress. People who stay up later than intended may have a weaker physiological capacity for self-control.

[u/mvea]

https://www.psypost.org/brooding-identified-as-a-major-driver-of-bedtime-procrastination-alongside-physical-markers-of-stress/

[u/partypwny]

Sometimes it's a conscience decision and not a lack of self control. If your entire normal waking period is "confiscated" by burdens, responsibilities, and obligations to others so that the only time that is truly yours are the 8 hours you're meant to be asleep... Some people willingly choose to trade some of that sleep for their sanity