This thesis appears to be related or the underlying research:

https://d.lib.msu.edu/etd/51312

Indicates 2mg and 5mg were given along with the placebo. While these are common dosages available in the US, these are higher dosages than recommended by at least some sleep experts. The thesis doesn't seem to differentiate between the dosages when evaluating cognitive processes.

Now I want to evaluate my sleep stack against morning cognition.