Andrew and others often talk about how important “intent” is. Charlie Morley emphasizes a sankalpa (dream plan) which is a detailed intention for what to do after getting lucid. In his retreats he has participants write their sankalpas, draw them and even act them out, all to help grease the skids for when we go into sleep. I’ve had a few dreams where I remembered my intent and sometimes I am able to do it (fly into space) but sometimes I just forget the intent in the excitement of being lucid. I remember one time where I was determined to do some healing and as soon as I became lucid I did something quite different and the dream responded by collapsing all around me, which I interpreted as a result of not keeping up my end of the bargain. I also have sleep/insomnia problems so that’s in the mix as well.
Note: see this thread for some ideas