Every night my room becomes a body of water but can't quite remember

I was just watching a video on YouTube and all I recall is that it was about a man who was searching for something in deep space. I looked at the screen and my mind went blank, yet I was able to watch it as it were a movie. In the video, there was an alien who would constantly tell the man, "you must remember." I don't know what they were talking about but I felt it was extremely important. I watched the entire video - I don't even know how long the video really lasted, in my mind it was a few seconds. I recently hit the snooze button so I was groggy. I don't know if it really happened or if it was a dream. All I know for certain is that it's not the first time I have these strange dreams. I also have no idea what these dreams mean to me.<br><br> Back to the question. Every night my room becomes a body of water but can't quite remember. Does it mean anything? Should I keep a diary?