Sand all over the blanket.
Yesterday's morning I woke up in my bed, and I discovered that all of the top of my blanket was covered in sand. Just the top of it, everything below the blanket, my pillow and napkin, was clean. Moreover, when I told about it my mum, she said that this sand can be found only near rivers/seas, and my house is located not far from one.
I don't think it's creepy or anything, but it's definitely mysterious, especially since the whole top of the blanket, from tail to head, was covered in a layer of sand, almost like deliberately.
Any ideas on what could happen?