Sleep Efficiency

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

Evidence summary

A well-established sleep measure central to cognitive behavioral therapy for insomnia.