I also have it set up so when I reply to the text message it logs it into a spreadsheet. My plan was to do some machine learning on my productivity. Haven't gotten around to that part yet though.
You might want to check out iDoneThis, which send you an email at the end of the day asking what you did. (I used it for about a month and then gave up, and it's less random, but it does log your responses.)
 https://pushover.net/ (links to both iOS and Play stores.)