yeah, we get lethargic easily after meals and at midday. i guess
such stuff is based on your own body and lifestyle. what sydney
posted is basically a generalised guide that helps more people on
the whole. there are always other plausible cases.
the healthiest way is to listen to your body. if you're tired,
chances are, almost 100% you really are tired. your body will not
trick you, play reverse psychology on you, or try to make a fool
out of you.