Meetings have the same effect on me… :)
I found working at home, I don’t get the afternoon sleepies. Could be an indoor air pollution issue (any extra hot air & CO2 in those meetings?? HA!). Some plants might help, or a personal air filter – or an open window if O2 levels are low.
I would also get some vitamin D – I take it regularly, here in Seattle we don’t get natural D from sun exposure from about October until May… so supplementing with vitamins or a tanning bed is a must.
Low D will definitely cause the drowsies.