October 2026

Cognitive Shuffling for Sleep: How It Works, Whether It Helps, and How to Try It

Cognitive shuffling is a bedtime mental exercise developed by researcher Luc Beaudoin, in which you picture a stream of random, unrelated, neutral things, switching every 5 to 15 seconds, to crowd out worries and mimic the scattered thoughts of falling asleep. The evidence is early: a few small studies, including one conference report on 154

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Cortisol Test for Sleep: Saliva vs. Urine vs. Blood

No cortisol test diagnoses insomnia. Doctors diagnose insomnia from your sleep history, not a hormone level. Cortisol tests answer narrower medical questions. Late-night saliva, 24-hour urine, and an overnight dexamethasone test screen for too much cortisol, known as Cushing’s syndrome. Morning blood tests and an ACTH stimulation test check for too little. Dried-urine panels like

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