I like the 4/7/8 (inhale/hold/exhale in seconds) = not sure if its “relaxation”, “sleepiness”, or both context-depending
Max/max/10, followed by
90%/max/10
80%/max/10, etc.
Point is to inhale slightly less each time, hold as long as you can, then slowly breathe out. Works wonders for helping me fall asleep or just generally relaxed when I’m anxious or not sleepy.