Sleep Common Questions

Your Sleep Score is a percentage (0–100%) that summarizes your sleep quality and efficiency each night.

Scores are categorized as follows:

• Poor sleep: below 70%

• Normal sleep: 70%–85%

• Excellent sleep: above 85%

• Time Asleep: Your total sleep duration.

• Deep Sleep: Your recorded Deep Sleep duration compared with Bevel’s scoring target, adjusted for age and biological sex when available.

• REM Sleep: Your recorded REM Sleep duration compared with Bevel’s scoring target.

• Heart Rate Dip: The reduction in your average heart rate during sleep compared with waking hours.

• Sleep Efficiency: The proportion of your time in bed spent asleep.

• Sleep Continuity: How uninterrupted your sleep was.

Tracking your Sleep Score over time helps you identify patterns and improve long-term sleep quality.

Different apps use different algorithms. Bevel calculates sleep with its own factors and weighting, so scores won’t match others. You can view more about Sleep Score here.

A lower Sleep Score can reflect insufficient sleep duration, Deep or REM Sleep below Bevel’s scoring targets, a smaller Heart Rate Dip, lower Sleep Efficiency, or more interrupted sleep.

Review your individual Sleep Score contributors to see which factors affected that night’s score.

Naps do not directly impact your Sleep Score, as the score only considers your primary (overnight) sleep.

However, naps can:

• Help reduce sleep debt

• Lower how much sleep you need the following night

You can view detailed sleep data in your Primary Sleep activity:

• From the Timeline, or

• Go to Sleep Score → Scroll down → Primary Sleep

Metrics include:

• Sleep Efficiency

• Sleep Continuity

• Heart Rate Dip

• Sleep Stages

• Time Asleep

Graphs include:

• Sleeping Heart Rate

• Sleeping Heart Rate Variability

• Sleeping Respiratory Rate

• Sleeping SpO₂

Bevel does not directly track sleep or naps, it reads data from Apple Health.

To check:

1. Open Apple Health → Sleep Score → Sleep

2. Scroll down and tap “Show All Data”

3. Review which app or device logged the entry

Incorrect nap data usually comes from another connected app or device.

You can manually add sleep in Bevel:

• Option 1: Go to Sleep Score → Scroll to the timeline → Tap the “+” button

• Option 2: On Timeline → Tap the “+” button → Tap “Sleep”

You can add:

• Sleep sessions for the current day

• Naps

Important notes:

• You cannot add full overnight sleep from previous nights

• Naps within ~15 minutes of your main sleep may merge into that session

For full control, you can also log sleep directly in Apple Health.

When your alarm is ringing:

• Open the Bevel Watch app

• Tap “Stop” instead of “Snooze”

If your Sleep Score remains low, review which contributors are consistently lower: Time Asleep, Deep Sleep, REM Sleep, Heart Rate Dip, Sleep Efficiency, or Sleep Continuity. Look at patterns over multiple nights. Maintaining a consistent sleep schedule, allowing enough time for sleep, and reducing nighttime disturbances may help.

On your watch, open the Alarm and tap the three dots in the top right corner. Once an alarm is set, scroll down to the Alarm Haptic section and choose your preferred intensity.

Options include: Progressive, Gentle, Medium, and Intense.

Yes. Bevel adjusts its Deep Sleep scoring target based on age and biological sex when that information is available. The target decreases with age. The target duration is calculated using your Sleep Needed, which incorporates your Sleep Goal, recent Strain, and Sleep Debt. Your rating is therefore not determined solely by Deep Sleep as a percentage of the time you actually slept.

Poor, Fair, Good, and Excellent describe how your recorded Deep Sleep compares with Bevel's scoring target. These ratings are separate from your personal historical range and overall Sleep Score. A Poor rating does not, by itself, establish that your sleep is medically abnormal.

For adults aged 30 to 70+, Bevel's Deep Sleep scoring target decreases with age, ranging from 13% down to 9% of Sleep Needed for males, and 14% down to 10% for females. These are Bevel's scoring targets, not clinical minimum requirements. If age or biological sex is unavailable, Bevel uses a default target of 12.5%.