Negative / Null Result ReportOpen accessMedicine

The Timing of the Melatonin Onset and Phase Angle to Sleep Onset in Older Adults after Uncontrolled vs. Controlled Lighting Conditions

Arturo Arrona-Palacios; Jung-Hie Lee; Charles A. Czeisler; Jeanne F. Duffy · 2023 · Clocks & Sleep

WASTE classifies this as Negative / Null Result Report · AI classification, approximate

The study found no significant effect — useful as a negative control or null benchmark for your own design.

Abstract

The main aim of this study was to explore how melatonin onset timing and phase angle to bedtime in healthy older adults are impacted by prior light exposure. A total of 13 healthy older (ages 56–74) individuals were studied on two successive evenings. Prior to the first evening, the participants were in self-selected lighting conditions for the first 4–6 h of the day and then were in dim light (3 lux) until their scheduled bedtime. On the second day, individuals from Project A remained in the dim lighting conditions throughout the entire day but those in Project B were in more typical indoor l

Abstract by Arturo Arrona-Palacios; Jung-Hie Lee; Charles A. Czeisler; Jeanne F. Duffy, Clocks & Sleep (2023) — licensed CC BY 4.0.

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