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.

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wincy 2 hours ago | parent | next [-]

I take 300mcg when I’m having a hard time getting to sleep or if I’ve had a lot of caffeine. Mostly because Scott Alexander told me to.

	▲	mutagen an hour ago \| parent [-]
		Yeah I'm in the 300 mcg camp, I take a time release formulation, try to take it early but often it isn't far off bedtime.

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turtleyacht 2 hours ago | parent | prev | next [-]

Coffee isn't mentioned. Morning cognition could be impacted by whether subjects take caffeine before starting tasks.

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2 hours ago | parent | prev | next [-]

[deleted]

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DANmode 2 hours ago | parent | prev [-]

5 is almost universally too much.

4 is almost universally too much..

3 is the most I’ve ever recommended.

More than enough.