Why would you want to prevent that?
Typically if you put a lot of energy into a spell or ritual you will get drained if you are not used to it.
But I would see these "deep slumbers" as way for your body to get the rest it needs and to get it's energy back. Perhaps grounding yourself will help, if you do not do that. I would also look into "centering" yourself as well.
I would also see it as my body and mind adjusting to the levels or energy being used. I believe that over time your body will get used to it, if you also ground and center yourself.