In a dream

Last night I had a dream. We were all having lunch, the whole extended family. I was seated beside my dad. He has happy, smiling and talking but I can't hear what was said; from him and also myself. There was simply no audio. Then it suddenly dawn on me that he is no longer with us. So how could he have joined us for this meal. I decided I should test it and stretch out my hand toward him. I was shocked that I could reach beyond him. It is like he was just a hologram, albeit a very good one. This caused me to suddenly wake up and realized that it wasn't real.