For sleep specifically I use a bonnet like this https://www.amazon.com/dp/B07VYJKPQ3/ref=cm_sw_r_cp_apa_glt_fabc_YMBBFMF2ZBMW6ACJ8TRP?_encoding=UTF8&psc=1

I can leave it down and loose. Or in 1 or 2 braids. When I leave it loose. I normally twist it up a bit into kind a bun then throw it in then put it on. It's hard to put loose hair in the bonnet otherwise.

For dealing with it being down. I have alot of hair too and I can't deal with it all down at once usually. If I want to show it off I'll usually do a half up style. A half bun or some viking style braid to keep most of it out of my face.

For the frizz a leave in conditioner for use on dry hair might help. Or use a drop or 2 of jojoba oil and it will help a bit with the frizz.