Kumar, G., Sasidharan, A., Kumar Nair, A., & Kutty, B. M. (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