Circadian Rhythms

The natural, roughly 24‑hour cycles that regulate alertness, cognitive performance, and mood in humans. Decision‑making quality follows this rhythm, peaking in the late morning for most people and declining in the afternoon and late evening. In digital commerce, circadian rhythms mean that a customer’s receptivity to an upsell is not constant throughout the day. An offer that requires careful feature comparison may convert better during high‑cognition morning hours; an impulse‑driven add‑on may convert better during the evening, when cognitive resources are lower and heuristic processing dominates. Time‑of‑day data is one of the simplest available signals for context‑aware selling.

Example: A travel platform shows stronger scarcity cues to late‑night searchers — who are statistically more likely to be booking urgent, same‑day stays — than to morning planners browsing future vacations.