The Missing 90 Minutes: Why Eight Hours of Sleep Can Still Leave You Exhausted.
You can spend eight or nine hours asleep and still wake up exhausted.
For years, that made no sense to the author. Brain fog, irritability and an afternoon collapse despite getting the recommended 8 hours of sleep. Then he noticed something hiding in sleep data he had barely opened: the nights that felt different often contained much more estimated deep sleep.
That observation did not prove that everyone needs exactly ninety minutes.It raised a better question: What happened inside those hours?
The Missing 90 Minutes is a plainspoken, evidence-informed look at Deep Sleep: what it is, why it matters, what quietly disrupts it and what you can realistically do about it.
Inside, you will learn:
Why time in bed, time asleep and restorative sleep are not the same thing
How alcohol, caffeine, stress, light, temperature and timing can affect sleep quality
Why consumer sleep trackers are useful whilte imperfect and easy to over-trust
How to run simple personal experiments without becoming obsessed with nightly scores
When persistent exhaustion may need medical investigation rather than another lifestyle tweak
This is not a promise that one number will fix every tired person. It is not a sales pitch for a supplement, gadget or perfect bedtime routine. Where the science is uncertain, the book says so. Where self-help ends, it tells you.
If you follow the usual sleep advice, get enough hours and still wake up tired, this book will help you stop blaming yourself, read the signals more clearly and work out what to change next.
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