I’ve lucid dreamed of being a bouncy ball, a point of light, an expanding star, and a floating eye, and I’ve had many entirely bodiless lucid dreams. [...] On rare occasion, we can even find ourselves inhabiting two different dream bodies simultaneously.
- Excerpt from Llewellyn’s Complete Book of Lucid Dreaming by Clare R. Johnson, PhD. PDF found here.
It can be hard to change one's human body in a lucid dream. Some LDers find that their LD body won't forget their IRL body, leading to dissonant situations such as looking different in a mirror but feeling their old body's limbs. The brain may not be used to the sensations it would have to give the dreamer from the new body.
However, there are LDers who find it easier to change into something inhuman because it's such an extremely different body that their brain finds it hard to slip up into a human one. In addition, many dreamers (lucid or not) can be inhabiting a different body from the start of their dream, no effort for changing needed.
The methods for fully changing one's body depend on the person. More of those methods:
( Read more... )
Many of these tips are meant to induce a degree of dissociation. If this is not wanted, the last 2 bullet points are ways to change the body without needing much dissociation in the process of obtaining the body.
There are no limits to lucid dreams. "The sky's the limit," doesn't apply here either, since one can change their body into the sky. Changing one's body in a lucid dream will never be impossible.