My brother @socratixsw1 introduced me to a incredibly powerful deep breathing practice. It’s a relaxant after stretching or before bed.
Inhale for 5 seconds; hold your breath for 5 seconds; exhale for 5 seconds; when you’ve emptied your lungs, don’t breathe in again for 5 seconds; then inhale for 5 seconds. Repeat for 1 minute or 3 cycles.
5 seconds in, 5 seconds hold, 5 seconds out, 5 seconds no breath. Draw the square in your head – 4 sides of 5 seconds each.
Start out with 3 sets which gets you to 1 minute. The 3 sets will turn into 6 sets pretty effortlessly once you find your stride.