A new study reveals that the foundation of solid sleep may rest on four core habits.

Over 31 days, roughly 39,000 healthy adults participated in what a team of international researchers dubbed the “Core Four Challenge.”

The objective of the study was to determine the combined impact of four circadian-aligning behaviors on sleep quality and overall health.

Participants were monitored with a WHOOP wrist device that tracked their sleep and cardiorespiratory metrics.

Members of the research team, who work in the Department of Performance Science for WHOOP, collected data over three months to establish a baseline and measure results during and after the four interventions.

They found that these changes improved sleep consistency, resting heart rate and heart rate variability (HRV).

“In

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