I had a nightmare, dreaming that I fell into the sea, couldn't swim and sank, but I didn't die.

It's that you are dishonest when you sleep, your head is covered with a cup, and you feel bored, but you are asleep, so in your subconscious, you imagine yourself falling into the sea and feel that sultry feeling is suffocating. But if I am too bored, I will struggle to get out of the quilt and breathe smoothly, but I am still dreaming, so I feel floating.