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Understanding your sleep metrics

Definitions of slow waves, sleep efficiency, drift off time, and other metrics

Caitlin Shure avatar
Written by Caitlin Shure
Updated yesterday

After your first night of sleep with Smartbuds, the Trends page in the app will begin to fill with data. Here’s a quick guide to what those numbers mean:

Metric

What It Means

Slow wave count

Slow waves are deep pulses of brain activity that mark your most restorative sleep. A higher slow wave count reflects better rest and recovery.

Slow wave time

The minutes you spend in deep, restorative sleep. More time here supports recovery for body and brain.

Sleep efficiency

The share of time in bed you’re actually asleep. Higher efficiency means less tossing and more consolidated rest.

Drift-off time

How long it takes you to fall asleep after starting a session. Shorter times suggest healthy sleep; longer times can reflect stress or irregular habits.

Total wakes

The number of times you wake during the night. Fewer wake-ups mean less fragmented sleep and deeper recovery.

Total sleep

Your overall hours asleep. Needs vary by person, but enough rest is key to energy, focus, and performance.

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