Ohh there are times when certain memories just stick with us like a glue and sometimes you cannot even recollect something that may have happened just in the near past. I have seen these days that my dreams get stuck to me, I keep thinking of them even days after I have had it.
I had the habit of sticking on to my past which was not very pleasant, but after doing a lot of Let Go practices I feel I have been able to shed off quite a lot and with that I also feel much lighter in my mind.