I’ve Seen A Neurologist And An ENT For Two Separate

Question: I’ve seen a neurologist and an ENT for two separate issues but I didn’t tell each about the symptoms the other is treating. I’ve seen a neurologist because I am having mild dream enactments. I had a sleep study done about 5 months ago. It indicated no gross motor movements but slight small movements during REM sleep. It said clinical correlation is required. The neurologist did a lot of testing and said I was doing well neurologically. The dream enactments have become more frequent but are still mild. I might scratch my hip in a dream and do it in real life or gently kick my leg a few inches if I was kicking in a dream. It's not a violent, forceful kick. It's gentle. This happens a few times a week. I once slightly jumped up with both my neck and shoulders. So this was a little more overall movement. She still said it seems mild and we can just monitor the symptoms.
I’ve also seen an ENT because I have an enlarged lymph node in my neck. I had an ultrasound done, which said the node was normal but my understanding is that ultrasounds of neck lymph nodes have only about an 80% accuracy. Considering my age and overall good health, the ENT was not worried about the lymph node. I didn’t tell him about the mild dream enactments though. I also have had a few instances when driving where my left ear feels slightly clogged (like there’s pressure) and the hearing might be diminished but after an hour or so it returns to normal. This happened a few times about a month ago but hasn’t happened since.
The conclusion section of the neck ultrasound says: "Impression: 1. Stable appearance of posterior left neck lymph node at level of patient's palpable lesion. 2. 2.1 x 0.8 cm left neck level II lymph node is observed with mild fatty hilum. 3. No suspicious neck lymph node seen."
Overall, despite the symptoms, I feel excellent. I have very good energy, workout, and seem to be doing well.
But I’m wondering if the enlarged lymph node changes the interpretation of the dream enactment. I didn't discuss this with the neurologist. Could the dream enactment be caused by a tumor in my brain that has spread to the lymphatic system? Or if it spread that much, would I likely have more symptoms than just mild dream enactment? Do I need a brain MRI?

Would the purpose of the brain MRI be to see if there is a tumor? Or to look for neurological degeneration? Anything else?

Also, what kind of MRI would it be? Would it use contrast?