Small differences are normal—sleep is estimated from heart rate and movement.
What can affect readings:
Fit: Improper fit (such as a ring that’s too large) can disrupt signals.
Wind-down time (reading/TV): Calm pre-bed activities can appear as wind-down or occasionally light sleep due to normal physiological drops in heart rate and movement.
Night movement: Awakenings (pets, kids, bathroom trips) can fragment sleep and shift stage estimates.
Battery: Low battery—or the ring dying overnight—can impact sleep stats.
Tips to improve accuracy:
Fit & placement: Wear the ring snug (not tight) with sensors on the palm side.
Try another finger: Everyone’s physiology is different. If readings seem off, try a different finger (often index or middle, non-dominant hand). Once you find the most reliable spot, stick with it for consistency.
Battery & sync: Keep battery above 40% and, after waking, open the AlterMe app with the ring nearby to sync.
Give it a few nights: Accuracy improves with consistent wear across multiple nights.