Something weird happened last night

I woke up at 3 a.m. after dreaming that there were lots of spiders and tarantulas in my room. I was frightened , and without really thinking about what I was doing, I walked into my brother’s room. My brother usually goes to sleep at around 4 a.m., so he was still awake.

I lay down on his bed and said, “Put your phone away and go to sleep.” He asked me what was wrong and why I was in his room. I told him that I had dreamed about spiders and wanted to sleep there.

He told me to go back to my room because he wasn’t going to sleep yet. I walked back to my room, and only then did I fully realize what I had just done.

What could this have been? This is the first time I’ve experienced something like this, and I’ve never sleepwalked before. Should I be concerned? Could it be a problem?