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Aggie, ever used Saran wrap? Lies completely flat against your head so no rustling while you sleep.
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asakeba, if you tie the saran wrap down on your forehead, it will stay on through the night. I find the plastic elastic has nothing on Saran wrap. A cap will slip more easily than Saran wrap for me coz I make sure that Saran wrap is saddled in for the entire ride:
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divachyk, using no product means hair that isn't wet ever. It's damp but never wet. I know this isn't something most people can do but other than that, maybe use a cap whose elastic is worn a bit (like a cap that's gone through the wash) so that it's not so tight. That way there's some room for air to escape so you're not really suffocating your head.