I wonder if it only works for a dedicated walking time (e.g. walk for 3 miles nonstop) or also for bursts of short walking during the day. I consistently get 3-5 miles of walking per day due to chasing kids around, taking short breaks during work, and doing chores, but rarely actually have a 30+ min sustained walk.

Benefits to both I think.

A sustained walk maximizes digestion and subconscious problem-solving benefits. Short bursts, especially w/ kids involved, maximizes spiritual fulfillment.

Both are probably great for metabolic health.

I walk over six kilometres (almost) every day and don't sleep well.

How's your sleeping environment? Do you have black out shades? Keep your room cool?

I have a toddler kicking me in the head.

(Even before that, I didn't sleep particularly well. Yes, when I visit a friend in the countryside, where it's really dark and quiet, I sleep better. Perhaps I should look into blackout shades!)