Sleep Efficiency
A measure of how much of your time in bed is real sleep.
Evidence: well established. We label every concept honestly, and say so when it's a teaching model. How we rate evidence.
Shrink Definition
Sleep efficiency is the share of time in bed that you actually spend asleep, a simple measure of sleep quality. Lying awake for long stretches lowers it, and spending too long in bed can worsen it by eroding the link between bed and sleep. High efficiency means you fall asleep fairly quickly and stay asleep. It's a key target in treating insomnia.
Plain language
The share of time in bed you actually spend asleep.
Shrink Insight
More time in bed isn't the same as more sleep.
Why it matters
It's a core target in insomnia treatment and a useful measure of sleep quality. It explains why spending longer in bed can backfire.
Common misunderstanding
People think spending more time in bed means better sleep. Too much time awake in bed lowers efficiency and can worsen insomnia.
Shrink Perspective
Quality of time in bed matters more than quantity.
Shrink Reflection
How much of my time in bed is spent awake?
Shrink Step
If you lie awake often, spend a little less time in bed, not more.
Shrink Minute
Notice how much of your time in bed is spent awake.
Shrink Takeaway
Better sleep is efficient, not just long.
Medical boundary
This concept is educational and shouldn't be used to self-diagnose. It doesn't replace care from a licensed clinician. Symptoms, medication, and treatment decisions should be discussed with a qualified professional, and emergency symptoms require emergency care.
Evidence summary
A well-established sleep measure central to cognitive behavioral therapy for insomnia.
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