Why timing matters as much as quantity

Advice on how to get good sleep is everywhere, with the market for sleep aids worth more than US$100 billion annually. However, scientists warn that online hacks and pricey tools aren’t always effective, and suggest that lessons learnt about the workings of a network of biological clocks found in the human body could ultimately lead to improved sleep.

This is an audio version of our Feature: How to get the best night’s sleep: what the science says

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