I used to sleep 10-12 hours! I found out that the reason I felt so exhausted all the time was because I was getting too much sleep. That was BEFORE I started dealing with insomnia. For a long time I would get so frustrated I wanted to cry. But I was also tossing and turning and feeling like I was going to explode with energy. My daughter is in her early 20's and unfortunately deals with insomnia. She said to me "don't look at it as necessarily a bad thing." - Wow! What a revelation. I had been spending years feeling crazy because I couldn't sleep. It was actually a schedule the world puts you on. I was getting like 2 hours of sleep (i.e., I was up all night).
I'm too tired to go to bed late! So now I get 7 hours of sleep - perfect. But that is broken up like this: 10 pm - 1 am. I get up and now look at that time as a pretty neat time that I can do extra things for/by myself. I stay up for a couple hours and go back to bed - I'm usually pretty tired by then. Sleep from 3 am - 7 am and that's 7 hours. So maybe instead of waking up so often - when you first wake up - wake up, get up, and stay up; and do the same thing the next time - or prolong how long you stay up.
This is a lot better for the partner. They can feel at ease that they know you're getting up and it's not so negative. They'll get at least an hour of quiet time. Otherwise they are bogged down by the tossing, turning, getting up so often, etc.
Hope so much that this helps!