Google "Swar Vigyan". Instead of looking for "studies", try these things on yourself for 30 days or so and journal what you experience.

Or try this -

Take breath with right nostril only - you'll feel warm or more energetic. Later take breath with left nostril only - you'll feel cold or more relaxed.

You can gamify this system when you certain type of tasks.

Or ask any old-school Yoga/Meditation teacher, preferably someone with roots in India.