Just before falling alseep:

I sometimes used to remember my whole day from the moment I went to bed to the moment I had awoken that day.
Then in the reverse memory time sequence (from sleeping to awakening that day) I would imagine the whole day wrapping up into a giant ballon and then slowly floating away with all my memories of that day.

The technique was two fold:
One - helped increase my memory
Two - helped me watch the stress of the day float away, and left my actual dream time free of the things that bothered me during the day.


The above technique offered if it helps
I would keep a dream journal, once you can

Best of luck to you!