Dream: Floating in a black ocean

I had this dream about a year ago.

I dreamt that I was a small child floating in a black ocean at night with no shore in sight. I was scared and tired of swimming. I didn’t even know which direction was getting me further away from shore or closer so I just floated. Then I saw my brother, who was also a child, swim towards me. He didn’t say anything but we both saw a huge black cup floating in the distance. He swam towards it and brought it back to me. We both got in and floated in it. By dawn we had arrived at the shore and an old man with a beard waved at us.
I woke up feeling lonely and cold.