Several exercise modalities improve sleep quality in patients with sleep disorders

[Bernardo de La Paz]

2. Yes, I had to look at article for defn of "mind-body exercises", but I am not surprised by the result

... showing mind-body most effective.

As they define it, mind-body exercises are not what we would generally call "exercise". It sounds like meditation. I had to look at the study summary for the definition they use (article page had a paywall rise up after a minute).

However there does not seem to be any examination of timing. It is well-known that physical exercise too close to bedtime is overly stimulating and interferes with sleep. On the flip side, the mind-body thing might benefit from being closer to bedtime than earlier.