Maybe they can regulate the dose that way compared to Prometrium
which come in at 100, 200, 300, and 400 mg I believe. And, since sleep has been an issue, perhaps the thinking was that you would benefit from the side effect progesterone has when it passes through the liver and gives off a by-product that makes you sleepy.
But, the progesterone itself should not cause these problems. You used the OVC at 2% for a few days as I recall and I don't think you had a similar problem.