Steady
Sleep stages, explained simply
A night of sleep is not one flat block. You cycle through lighter sleep, deeper sleep and REM. Wearables estimate those stages so you can see the shape of a night — not so every percentage has to be perfect.
The main stages
- Light sleep — you spend a large share of the night here. It bridges waking and deeper stages and still supports rest.
- Deep sleep — harder to wake from; often linked with physical recovery. Many adults see less of it with age.
- REM sleep — vivid dreaming is common here; it plays a role in memory and mood regulation.
- Awake time — brief awakenings are normal even when you do not remember them.
Why totals matter more than one night
Alcohol, late meals, illness, travel and training can reshuffle stages. A single odd hypnogram is common. A week of short deep sleep plus rough mornings is a clearer story than Tuesday’s chart alone.
In Steady: sleep sits beside stress and the rest of your health summary, so a thin night has context instead of sitting in isolation.
Practical habits that still win
A steady bedtime window, morning light, cooler rooms and fewer late stimulants help more people than chasing a perfect stage mix. If snoring, gasping or extreme daytime sleepiness show up, that is a cue for clinical advice — not another app setting.
Steady is a wellness companion, not a medical device. Wearable sleep stages are estimates. This guide is for everyday understanding only and is not clinical advice.