Different strains.
Different properties.
That trope of weed making you lazy and sleepy comes from the indica dominant strains that were out in the early 80/90's when shyt was just Reggie. That's what I've been told from folk old enough to do the science on it.
Any self respecting weed smoker should know what strain they smoking or at least be able to discern if a batch is giving him/her to that full body numbing shyt or that mind racing creative energy shyt.
That's why I got two pot jars. One for uppers and one for downers; semi opiate shyt,
but I'm nothing if not a thorough man when it comes to this drug shyt.