Timing of AI drugs

I am on Exemestane and had been taking it following my breakfast. I also take my other routine meds at that time. I get so tired and sleepy about 2 hours later. My B/P med could do that even though been on it forever without that happening. I have just shifted the Exemestane to noon. Anyone else have that issue? I know fatigue is a huge problem with AI drugs and I guess some of that is to be expected. Just wondering if time of day helps.