I'd mentioned a little while back that I'd begun experimenting with using physical sensations as a means to create a dream reality where I could do internal work. I've found since that original post that what seems to work best for me, if I want to do a night of internal work is a kinisthetic sensation. I've tried visualization, but visualization seems to work better as a secondary sensory tool used to create an environment around the kinisthetic sensation. I'm not sure that this "rule" would apply to everyone. It may only apply to me because I'm a kinisthetic learner first, and a visual learner second, and an audio learner last. For a visual learner, using some kind of visual stimuli may work better for creating an initial dream environment in which the internal work will be done. Likewise an audio learner may find that an audio signal is best.
I've found that using kinisthetic sensations has helped me create dream environments I can work with so that I'm doing some form of internal work while sleeping. It seems to be most helpful if I use a sensation I felt during the day before I do the dream work. Trying to draw on older memories of sensations is less helpful, especially as those memories get replaced by newer experiences. It does help if the sensation is unusual. I've found that focusing on sensations that my feet feel is particularly useful, partially because of how sensitive feet are and partially because I don't normally go out of my way to pay attention to what my feet feel. I now have that incentive, in order to create a dream environment I can work in, but it can also work with any other sensitive area of your body.