Rabbits that have been frequently placed in a TI position learn to anticipate when this will happen, and become stressed more quickly and enter a TI state more quickly.
Rabbits do not have to be have to be fully reclined to be in a TI/Trance.
Gallup, G.G. (1974) Animal hypnosis: factual status of a fictional concept. Psychological Bulletin, 81, 836-853 McBride, A, (2015) Animals in trances: peace of mind or panic. Rabbiting On, Winter 2015 issue, 10-12