Optional, and I don't always do it, but when it fits the vibe it works.
I pick a scent just for the night, or a small object that lives in my purse. One thing, used only for this.
Then every time I smell it or touch it, it's an instant check-in cue — a tap on the shoulder from the version of me who was calm and thinking clearly a day earlier. A talisman with a job.
It also gives the night edges. Something to put on when it starts and take off when it's done, so the experience has a shape instead of bleeding into Tuesday.