I suspect the dosage and absorption isn't fully understood yet or very individual. For me some 2mg pills work fine and other 3mg pills don't; currently I use 4mg time-release and it's mostly fine. 1 mg is definitely not enough for me.
I would be groggy a few hours after taking the pill but not in the morning.
I would be groggy a few hours after taking the pill but not in the morning.