I used to take mine around 6am and no way does it make you drousy, actually the opposite, yyour house will be sparkling lol. It gives you so much energy, make sure you eat. The only reason I would get cranky is because come 4pm I hadnt eaten all day, so my body was kranky.
Eat breaky with your tablet then have lunch.
That sorted me out with my moods
Goodluck mate

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B