Dolphins, floating Table, and the grocery Bag

"I was in the ocean with a group of dolphins, although I don't remember getting into the water. The water felt warm and I wasn't worried about being so far from shore. One dolphin kept swimming close to me and would disappear under the water, then come back beside me. At some point I was trying to follow it, but my legs suddenly felt heavy and I couldn't swim properly. I grabbed onto something that felt like the edge of a boat, but when I looked, it was just a wooden table floating in the water. Then I was suddenly on a beach, still wet, watching the dolphins jump near the shore. One of them came right up to me and looked at me for a long time. I wanted to touch it, but somehow I was holding a grocery bag instead. I don't remember much after that. I just remember laughing and feeling really happy when I woke up."