I do find the same great productivity and focus at the same hour (usually). However, this happens from my sleep schedule sliding to where I end up nocturnal, no

I do find the same great productivity and focus at the same hour (usually). However, this happens from my sleep schedule sliding to where I end up nocturnal, not from something like caffeine or nicotine. Waking up at 11PM and staying up until the late AM of the next day.