This will come as no surprise to anyone who meditates and is nicely summed up by maharishi who introduced Transcendental Meditation to the world  in the late 1950’s :

“Meditation is a bit like being asleep, but being awake to enjoy it.”

Short daytime naps may keep brain healthy as it ages, study says

Brief doze may delay brain shrinkage, which occurs faster in people with neurodegenerative diseases