“How are people supposed to know?” – Refeeding syndrome can be fatal in hedgehogs. Too much food at once, offered to quills by well-intentioned people, can cause organs, including the heart, to fail.
It is often too late when people notice the hedgehog's apathetic state. 24garten.de explains here whether a hedgehog is healthy or sick. Found an emaciated hedgehog, what to do? Hedgehogs awaken from hibernation from March to around mid-April.