Kumar, Gulshan, Arun Sasidharan, Ajay Kumar Nair, and Bindu M. Kutty. 2018. “Efficacy of the Combination of Cognitive Training and Acoustic Stimulation in Eliciting Lucid Dreams During Undisturbed Sleep - a Pilot Study Using Polysomnography, Dream Reports and Questionnaires”. International Journal of Dream Research 11 (2):197-202. https://doi.org/10.11588/ijodr.2018.2.46417.