Some villagers sleep during the day.
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Thank you for your report!
However, this issue is a Duplicate of MCPE-45178.
That ticket has already been resolved, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Works as inteded. Because of this, the villager you saw is a nitwit villager, a villager that offers no trades. They will sleep longer than other villagers, and probably stay up at night and eventually sleep.