Erasable writing

Part of the Christmas gift from work was this notepad with special pens and a cloth. You can write something down and erase it again. Up until now I wasn't sure what to use it for. 

I often go to bed thinking I mustn't forget to do this or that the next day. Perfect to write this down on this notepad! 

It has a lot of pages. I wonder if there's anyone out there who will fill up the notepad and will then erase all of it?