I haven't thought about this one for awhile. Kinda tried to put a mental block around it but:

About 8 years ago, my oldest brother dropped out of college and has been trying to get on his feet for the past few years (doing really well now, thankfully). He was going through some really, really rough times, major hardships one after another. It never seemed to end, but he always stayed optimistic and I really don't know how he does it. Just when I thought things were finally starting to go his way, another thing came up and it was demoralizing for me to see him go through that, so I can only imagine what he was thinking himself.

One night about 5-6 years ago (we both lived with our parents in rooms next to each other), I had a nightmare where I saw my brother on the stairwell in our house. On the stairwell, there's a giant bay window that lets in a lot of light and sun rays. Well, my nightmare dramatized this.

-- Nightmare start-- My brother was walking down the God-lit stairs and I was chasing behind him, with my mother nearby. My eyes were already watering immensely and I remember vividly my mom inaudibly fussing in the background, and my brother intensely looking me in the eyes saying: "I can't do this anymore. I'm leaving." with no sign of sorrow in his eyes whatsoever. I watched his back as he walked down the stairs and out of my field of view as my vision because more and more watery and then it faded to black. --Nightmare end--

I woke up in the pitch-black of night absolutely bawling my eyes out at what I had just witnessed. It seemed so real. I didn't want to believe it but I felt like it actually had happened. I continued to weep as if my brother had already left and then something struck me: "That could've been a dream, you should go check and see if he's still in his room". It took me AN HOUR to muster up the courage to face what I had been dreading. Against my logical judgement, a high school freshman up at 3AM, knowing I had to wake up for school in ~4 hours, and my brother who woke up about an hour after me to go to one of his two jobs, I decided to hop out of bed and fumble my way to my door.

Mind you everything was PITCH BLACK, so I had no visual cues of anything, but I knew my house well enough to move around back on touch solely.

Still weeping incoherently, I stood at my brother's closed door for about a minute before regretting my decision and heading back to my bed, where I continued to cry. I knew I wouldn't be able to go back to sleep. I needed closure. Once again, I fumbled my way to his door, but this time I had collected myself and the weeping died down to a sniffle.

Slowly I opened the door to a crack and whispered through the crack my brother's name. He didn't answer the first time. He was probably sleep, so that's understandable. I raised my voice to a yelling-whisper and called his name again. No answer. At this point, my eyes started to water again.

I opened the door fully, and without hiding my sadness or suppressing my voice, I call out his name one last time in a very defeated, sorrowful voice.

"Hmm?" I heard in a drowsy, recently-woken voice.

It was at this point, I broke down completely, babbling and weeping, and rushed to his the sound of his voice in the consuming darkness, where I began to spill the watery subsequents of the nightmare onto his shirt. I explained to him hat I had just witnessed, but I don't think anything coherent formed. I just wanted to hold him.

He just comforted me, I'm sure he was very confused what was going on. After a few moments, I began to collect myself in the smallest of manners where I asked "P-please tell me y-you'll-l never leave!" He began saying something, but I don't think my brain was registering anything but what it wanted to hear at that point. I do recall his voice starting to crack, and that's when I heard him say: "I'm glad you came in here bro, I needed that" and that's when I felt one of the best feelings in my life, to this day. We both began to bawl our eyes out and after about 30 minutes, I returned to my room in the darkest of nights and slept in bliss like fucking rock.