Zopiclone

I took a zopiclone before I went to bed last night and fell asleep very quickly. However I woke up just after 4am in a mess. My bed was wet and I was shaking. Usually I get up and go to have a shower but last night I just couldn't ground myself. I couldn't move and the nightmare continued to rage in my head. It was like I couldn't wake up.
So I'm in a dilemma tonight - do I take another one or not? I did eventually get sorted and back to sleep where I managed to sleep until 10am. However despite the sleep I have felt foggy all day, almost like I have been out for a night on the tiles. There was so much I wanted to do today but I've struggled to do anything. I'm beginning to wonder if taking the tablet is worth it. I'm not sure if it has a cumulative affect and if I will feel worse tomorrow.
It is just not clear on the literature that came with the medication. I know people that have taken zopiclone for years and I really don't know how they do it. I think I'm just not prepared to feel crap the next day and to struggle with my nightmare - I guess it is just not worth it for a few hours more sleep.