What do the indicators (arrows) next to sleep quality mean?

The different colours are designating good (green, quality >70%), mediocre (yellow, quality 40% - 70%) or poor (red, quality <40%) sleep quality.

Arrow indicators for alongside the daily quality and duration values, indicate the change from the last recorded session. The respective indicators alongside the average quality and duration values show how the currently viewed session values compare to the average ones. A dash sign, would indicate unchanged sleep quality.

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