Meditation seems to reduce sleep need in experienced meditators User hypnotickefir, in the The Science of Happy and Healthy subreddit, 03 Feb 2019
Study: Meditation acutely improves psychomotor vigilance, and may decrease sleep need User Ariyas108, in the Meditation subreddit, 07 Jul 2016
TIL that meditation reduces the need for sleep, in terms of maintaining alertness and reaction times. User pompandpride, in the Today I Learned (TIL) subreddit, 19 Aug 2013