Why was it significant. The phone ringing prior probably caused your nightmare. You heard it, and in your mind caused a dream. Literally. You possibly thought or even spoke of your brother when you were drunk. Then you slept and it caused you dream it. If there was any other sounds, phone, split seconds are enough to have multi dimensional dreams.

I know I have had them. The sleep disorder I have has caused dreams in 10 seconds of sleep. Sometimes I start to dream before I am asleep, entering a dreamstate when I am still awake. You can test this yourself. I dare say almost everybody who passes out, enters a dreamstate. Not everybody dreams, remembers, when passed out. Most actually and actively do dream in this state. Simple method, not doctor approved, is simple compression on the chest. Seconds of being passed out is enough to have caused hours of assumed loss or entire dreams. I am not saying that's my sleep disorder. An example of dreams happening in seconds.

It caused in the previous reply, ghosts. Years I was haunted by a reoccurring dream of the shadow people, apparitions, see through. Male mostly. Twice female. My room exactly the same as if awake, darkened or not, the same layout everything the same as if my eyes were open. Except it was a dream, and there's a see through human silhouette. It approaches closer, it peaks my interest, a childlike curiosity, but it gets closer towards my bed. The same bed as if I am awake, and it is malevolent. I sense harm, I start to scream, but it's the Matrix Neo interview, no sound if you can't speak. I never dream of myself, I know it's me, but it never is visually me in dreams, unless I actually see myself lying there. I wake up I am screaming so loud it is deafening, enough to be heard like somebody having the worst done to them. Blood curdling screams. This reoccurred for years, along with the feeling of pins and needles, it wasn't pins and needles, it was horrible. Akin to something big, like a rat, really fast crawling up my leg and back, painfully scratching at it, all the way up it, shin to neck, most thighs, lower back, it felt like claws or hands. No marks on my body on inspection on awaking.

It stopped, I haven't had those dreams again. Don't want too. Had nightmares and screamed at them, since, talked myself awake in other dreams. Sometimes it wasn't even me speaking in the dream, it was somebody else in my mind, communicating in thoughts. But I wake up and I am stupidly saying something. It wasn't even important. The last time I dreamt a poem I awoke talking myself awake. Beautiful dream, I was some kind of an alter ego, Godlike, and there was this girl. But I woke up saying, Under the temple of the sky we danced, I chased, you ran, we embraced, I found you. I woke up with this booming in my head, booming thunderously, and me speaking it. I couldn't work out where it was from? It's from somewhere.

Enough of dreams. I hope you and your brother work stuff out.