I'd say I felt much more rested (but that's obvious) after the first few nights, but overall mood and mental improvements seemed to be noticeable, on reflection

I'd say I felt much more rested (but that's obvious) after the first few nights, but overall mood and mental improvements seemed to be noticeable, on reflection, a month or two in. I think even if I didn't feel subjectively better though, I'd keep doing it. I choose to trust our existing body of scientific knowledge about how damaging lack of sleep is and how critical sleep is for long term mental and physical health.