I have slept really well since I had my Mirena, unless it is coincidence or the oestrogen that I started at the same time, but I have never felt sedated.
That doesn't answer your question though, but I did not find utrogestan sedating at all...I felt wired up to the electricity supply, especially at night
![Sad :(](https://www.menopausematters.co.uk/forum/Smileys/extended/sad.gif)
So maybe the progesterone in the Mirena is firing you up! We all seem to tick in different ways.