Effexor & Prozac Drowsiness | ADHD Information

My Dr. is switching me from effexor to prozac and for 7 days im suppose to take 20mg prozac and 150 effexor in the am.  Then after the 7th day, 2 prozacs for total of 40mg.  I use to take the effexor at night then a 2 weeks ago she wanted me to switch to taking them in the am.  I did, but started to get drowsy...  Then adding the prozac starting 2/14 just added more drowsiness.  So I switched back to taking them at night.  Has anyone gotten drowsy on effexor and/or prozac?  My dr. said "people dont usually get drowsy on it", HOWEVER if they dont why would they have a "may cause drowsiness" warning on the damn bottle!!!  Just wondering if anyone has suffered from drowsiness on either one....