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If you tie them up, in a braid, or bun overnight they keep longer. Sleeping cap is the ideal solution, but requires a sleeping cap. Just don't sleep with open hair.
I also like putting some oil into them overnight, but ymmv.
I did in fact find that the curls held really well when I scrunchy'd them up overnight, but tangles. Also my hair is down to my ass so Idrk if a bun or cap would be feasible.
You could look into what kind of caps exist, you are certainly not the only curly haired person with very long hair.
Looked it up, jumbo nightcaps exist.
About the tangles: I always brush in the shower with conditioner in my hair, never dry, because it would be very annoying and painful, because of tangles. Thanks to my hairtype you don't see them anyway, so I don't need to wash everyday.