Is It Normal for a Four-Year-Old to Wet the Bed?

My child is four years old, and I don’t know what’s been going on lately. He wets the bed every night and cries and screams, not sure if he’s been scared. Or maybe he’s wetting the bed because of a nightmare? I’d like to ask about a child’s bedwetting issue. Is it normal for a four-year-old to still wet the bed?
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