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Understanding Last Night's Sleep Data

Why should I record how my sleep felt? What data shows up on my Last Night's Sleep summary? Where can I find my detailed sleep summary? How do I read my sleep summary?

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Written by Fulcra Team
Updated today

The Last Night's Sleep summary gives you a full picture of what your wearable captured while you slept, like sleep stages, efficiency, and other health metrics recorded overnight.

Getting there

In the Focus tab, the first card you'll see is Last Night's Sleep. Tap the expand button to see the full summary.


What's in it

Sleep Summary

At the top, you'll see your core sleep stats for the night: total time asleep, sleep efficiency, and a breakdown of your sleep stages: REM, Core, Deep, and time spent Awake. These are pulled directly from your wearable.

Comparing sleep with other data

The middle section lets you layer your sleep data against other health metrics captured overnight. You can also swipe left/right on the comparison chart to navigate between previous night’s sleep to compare it with your sleep data on other days.

Tap the data track buttons — Heart Rate, HRV, Respiratory Rate, Body Temp, Environmental Audio, and others — to see how each tracked alongside your sleep stages across the night.

This is where patterns start to become visible. Seeing your heart rate plotted against your sleep stages, for example, can reveal things a single number never could, like whether your heart rate spiked during a period of wakefulness, or stayed consistently low through your deep sleep window.

At the bottom you'll find additional data captured overnight: respiratory rate, body temperature, and sleep latency (how long it took you to fall asleep).


The Last Night's Sleep summary shows the objective side of your sleep. Combined with logging how your sleep actually felt, it's what allows Context to surface insights about what's genuinely influencing your rest.

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