Each entry opens with a direct answer, then explains the science, how it applies in daily life, what the nuance is, and when to seek professional help.
2 entries
Reactivity to stress carries information that stress exposure alone does not. Two people can face similar demands and sleep very differently, and how intensely a person responds tracks with sleep quality rather than the raw count of stressful events.
6 min read · Updated 2025
Consumer trackers are reasonable at estimating when you were asleep and how regular your schedule is. They are much weaker at sleep stages and single-night precision, and no score on a wearable is a diagnosis.
7 min read · Updated 2026
Short, evidence-based explanations of interesting and useful ideas in sleep, circadian science, behavior change, and sleep technology.
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