Jim,
The cold air following a front's passage is usually very dry, around 5%-35% relative humidity, and dry out the nasal, throat and mouth membranes. The face coverings, like the balaclava, could help you with those symptoms as your body fights the dryness with coughing, dry throat drainage and nasal drainage to try and hydrate the membranes. The joint aches can be from the air pressure change to the high pressure after a front passes. The sleepiness is found in cases of hypothermia. probably a matter of using your cold weather gear.
Best of luck, thankfully Florida doesn't have a many cold days, (not being a smart ass Dudelsack!) I still need layers to ride no matter.
Bill
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Semper Fi, USMC, 1975-1977
I Can Do All Things Through Him, Who Gives Me Strength. Philippians 4:13