As in prior posts: 10 mgs nightly seven days per week. I take it along with other prescribed meds and supplements about 30 minutes after evening meal. We have dinner anywhere from 5:15 to 5:45. One of those supplements is magnesium, another is alpha lipoic acid.
No, I do not take it during daytime hours. I'd wind up sleepy and non-productive. I would never consider taking a daytime dose.