For fitness its probably decent but Garmin seems to have placebo sleep tracking. In order to get anything remotely accurate the sleep tracking algorithm has to be compared to a lot of polysomnograph data. But because companies don’t want to spend any more than they need to sleep tracking is usually just tacked on. Garmin hasn’t shown a good track record in this regard.
For fitness its probably decent but Garmin seems to have placebo sleep tracking. In order to get anything remotely accurate the sleep tracking algorithm has to be compared to a lot of polysomnograph data. But because companies don’t want to spend any more than they need to sleep tracking is usually just tacked on. Garmin hasn’t shown a good track record in this regard.