Long exhale breathing
Technique
Falling asleep, de-stressing, lowering activation
"If you want to slow your heart rate down anytime in waking to de-stress or just bring your level of activation down, or if you want to fall asleep, it really helps to do some long exhales until lungs are empty and then just passive inhales."
More source quotes
"Long exhale breathing which just simply reduces heart rate. So this is the you don't need to do breath work. You just if you want to calm down you do a long exhale."