If nothing comes to mind when you wake up, try jogging your memory by thinking about typical dream items and try to feel if something may have been in the dream before. Some dream signs appear quite often so you may recall you actually dreamed of this particular thing and then recall parts or even the whole dream.

Another thing would be not to rush out of bed and concentrate on day activities immediately. Try waking up 5-10 mins before your final wake time, to allow yourself to calmly recall and record your dreams.

Finally, you may consider having small pre bed snacks to give your brain a boost.