This happens to me with commercial beers as well. I plan to take a couple days off from drinking my IPA.
On my last IPA I poured one a couple times and felt like the aroma was great but not strong enough, like it had faded prematurely. Now this was a beer I dryhopped with 6 oz ! Each time a day or two later, I poured one and the aroma was big, where it had been all along. Mood, fatigue, sinus/allergy issues all definitely play into it for me.
How true. About half an hour into my IPA I'll be doubting its intensity of aroma hoppiness and wondering if it's really this restrained. A little time away from it and it's back baby.
I am oh so thankful this also happens when I drink really intense commercial IPA's.