@captainsnumple ​replied to your post   “I think, especially as she gets older, Rei talks a lot in her sleep….”  

 Imagine that sometimes she talks about her visions and the stuff that
worries her and Minako like MAKES NOTES but then she’s just straight up
talking for 20 minutes telling some action-adventure story about her
skirt flying over Tokyo and shitting on everyone’s heads
(Minako is taking notes for that too because she could use it to kinkshame Rei later)

YES. I imagine for the former, Mina debates waking Rei up to comfort her or talk, but knows Rei would clam up if she knew Mina was privy to these things.

ALSO. Please imagine Rei being unexpectedly affectionate sometimes in sleep, not ever saying “I love you” but little things she wouldn’t say consciously yet, like “I want you close to me” while snuggling into Mina’s chest. Mina just has to lie there with this wonderful terrible secret affection and hope Rei will reach that level while awake soon.