I think that if enough estrogen is taken to replace androgen, it shouldn't be an issue. Progesterone may make one sleepy as could be the case for cyproterone acetate (i.e. fatigue, tiredness) as well. To sleep that much, as far as I'm concerned, is ok as long as it doesn't last too long. If this persists more than a few weeks, I would be concerned and talk to my doctor about this. On low estrogen, I was quite sleepy and depressed. Increasing E resolved this issue for me.