An evening reflection practice sets aside a few minutes before sleep to review the day, briefly noting what went well, what was difficult, and what might be handled differently tomorrow, giving the mind a structured place to process the day rather than leaving that processing to happen involuntarily once the lights are off.
Keeping the reflection brief matters considerably, since an elaborate nightly review is far more likely to be abandoned within a few weeks than a genuinely short one that takes only a few minutes and asks only two or three simple, consistent questions each night. The pattern becomes obvious only once enough of it has already accumulated.
Over time, this small ritual tends to improve sleep for many people, partly by giving anxious, looping thoughts somewhere deliberate to go earlier in the evening, rather than leaving them to surface unprompted and unresolved once the person is finally lying in bed trying to fall asleep.