Eli5: Why do adults sleep with pillows when babies do not? What are the benefits of using a pillow as an adult?

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I noticed that I actually slept better this week when I wasn’t using a pillow. Made me curious.

ETA: I think my framing was slightly unhelpful. I do understand why babies don’t sleep with pillows due to the risks. I am more curious about if there are benefits to using a pillow as an adult.

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