Okay kiddo, let me explain the sleeper effect to you in a way that you can easily understand.
Have you ever heard of the story "The Tortoise and the Hare"? You know how in the story, the tortoise is slow but steady and eventually wins the race, while the hare is fast but overconfident and ends up losing?
Well, imagine you hear that story from someone who you don't really like or trust, maybe someone who is mean to you or always does things you don't approve of. At first, you might think "I don't believe them. They're mean and not trustworthy." But over time, you might start to forget who even told you the story, and all you can remember is the story itself.
So later on, if someone were to ask you "Hey, do you remember the story of the tortoise and the hare?" you might say "Yes, I do! It's about how slow and steady wins the race!" even though you don't like or trust the person who originally told it to you.
That's what we call the "sleeper effect." It means that over time, we can forget where we heard something from, and just remember the actual message or story itself. So even if we didn't trust the person who told us something at first, we could end up believing it anyway if we keep hearing it enough times.
That's why it's important to question what we hear and think critically about things. Just because we remember something doesn't mean it's automatically true or trustworthy!