Pdoc gave me samples of Belsomra. She said that I probably would
not take it (she knows me now) but explained how it works: apparently it
deactivates the awake part of our brain.

(My mdoc wanted to give me some at our last appt. I said "no".)

What You Should Know Before Trying New Sleeping Pill Belsomra | The Huffington Post

How Does BELSOMRA(R) (suvorexant) C-IV Work Differently?

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