shorter menstrual cycles

my cycles used to be 33 days. Lately in last 5 months it got shorter and shorter. it became 28, then 26 then its now 23! i freak out.
could it because I am lately stressed more about lack of physical love and sex in my marriage? Could it because of the sleepless nights?
My marriage was the same all of these years, but lately I am more and more frustrated about it!
I want my normal cycles back!!