Kaul, P., Passafiume, J., Sargent, C. R., & O'Hara, B. F. (2010). Meditation acutely improves psychomotor vigilance, and may decrease sleep need. Behavioral And Brain Functions : Bbf, 6, 47. https://doi.org/10.1186/1744-9081-6-47 (Original work published 2010)