Is it a bad idea to sneak into a neighbor's pool late at night?

I don't have a pool at my house and so I had an idea to sneak into a neighbor's pool late at night like at 3 or 4am and go for a swim. I was thinking about doing it around that time since they would be asleep at that time. Would this be a bad idea to do?
Is it a bad idea to sneak into a neighbor's pool late at night?
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