Sometimes I realize hours or days later that I missed something obvious and important, but of course I cannot do this for every social interaction because I don't have time. Also, thinking about it leaves me mentally exhausted in the same way that organic chemistry and advanced mathematics (two subjects I find easy) do for neurotypicals. But my after-the-fact realizations are contingent upon my noticing and remembering specific details that indicate emotion, which is totally hit-or-miss.