https://www.healthline.com/health/hedonic-treadmill#bottom-line
Medically reviewed by Timothy J. Legg, PhD, PsyD — Written by Rebecca Joy Stanborough, MFA: Rebecca’s article says:
\tPsychologists say that when human beings experience something good — a long-awaited promotion, a new car, a winning lottery ticket, for instance — the surge of happiness that’s experienced is likely to return to a steady personal baseline over time.
\tIt’s a phenomenon known as the “hedonic treadmill,” sometimes also referred to as hedonic adaptation.
\tInterestingly, the same principle applies to difficult events. Most of the time, when people experience a loss or setback, the feelings that accompany the negative event lessen in severity over time.
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