There are two things at play. The first is that your body isn’t using much energy so it can focus everything on healing. The other is that 8 hours more or less go by without you noticing. So you are healing at a fair rate during the day, but you don’t notice as much because it’s happening slowly while you’re awake. When you sleep, you suddenly wake up and the equivalent of half a day’s worth of healing has suddenly happened.
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