by "reggies" are you referring to schwag?

you may be feeling less "groggy" as your usual erb may be more indica dominant, while the sour diesel may be more sativa.

however, "groggy" refers to a sick/tired feeling after one has consumed an excess of rum diluted with water. the term was coined by an old british admiral, nicknamed "old grogman" who diulted his sailor's rations of rum with water to save supply.

peace

edit: i do not understand why you would ever experience a headache after smoking. details?