Okay but hear me out—
Wally sometimes dreams of the Speedforce and doesn’t treat it as a nightmare. He’ll go almost perfectly still and his breathing and heart rate would drop, almost as if he died. It’s deeper than sleep.
Bruce’ll wake up to the sudden stillness and for a second, he thinks Wally is dead (almost always, that’s the first thing that pops up no matter how many times he’s dealt with this before). He’ll watch Wally slowly and surely, unblinking.
When Wally wakes up from the dream, he’ll turn over and see Bruce staring. He’ll push his head to the crook of his neck, tracing nondescript patterns down Bruce’s back, mouthing silent apologies.