Sleeping distracted

The assignment was to choose from a list of three toys, a dildo, ben wa balls, and a butt plug, and sleep with it in. I chose the butt plug. An assignment like this is not designed to be easy, it is designed to show how much power Master has over a slave, and how He can have her do something outside of her own comfort level for Him, simply because He has told her to do so, even if she knows it provides no enjoyment to Him either. I chose the butt plug because Master knows how uncomfortable I find anal play and that I do not enjoy it. So making this choice would put me outside of my comfort zone.
My bed time is 10, and lights out is 11. So, after a shower, I put the plug in at 9:50 and got ready for bed. It was uncomfortable at first, feeling something deep within. I tried to ignore the feeling, and it was uncomfortable. There is something disconcerting about sleeping with a piece of rubber stuffed into your backdoor.
I had some trouble falling asleep, but I eventually did. The plug did its job, though. I found myself having explicit dreams of Master taking my backdoor, something He did once but has never been able to do with ease, and it is something I have always fought Him on. This is the last place Master has not "forcefully" taken me.
I woke up from the tormentous night sleep fully aroused and frustrated, having not orgasmed even in sleep, my body is so trained after all the years, that I did not orgasm even once from the night's dreams, despite how turned on and aroused I woke up.
This assignment has actually sparked a renewed interest in anal play, and I have been pondering asking Master if I can continue to sleep with the plug in every few days to maybe open myself up more (pun intended) for some occasional anal play since I clentch and tighten up right now from even the thought of Master fucking my ass with the dildo while He is fucking me.