Could Drowsiness And Lethargy Be The Side Effects Of Efexxor?

I am on efexxor and after reading this think I perhaps I should take it at night as I believe that it is making me sleepy and generally slow ( although I get less done I do tend to not get uptight out about it much - just carry on). Tended previously to be manic and generally energenic and optimistic in summer and most effected negatively after the fall time change. I do drink alcohol daily but generally not more than a glass or two of wine - sometimes more on weekends - but have always had a high tolerance to alcohol. I am steadily taking the medication but am considering a change as I am not liking the drowsiness and general lethargy I am experiencing. Any thoughts.