You can't sleep with some old kinds of contacts on because of hydration issues. The last contacts I've worn were made over ten years ago, so I don't know how today's common ones are in respect to that. We have overnight ortho-k today, though, which are contacts designed to be worn only while you're sleeping, so I don't think it'd be too far-fetched for an AU set a few years away from now to have contacts that are perfectly safe to sleep with.
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