I sleep a lot, but I don't often feel well-rested. Sleeping is nice, but I perceive it as going by so quickly that it doesn't do much to reduce my suffering. It's a very good escape when I feel anxiety or pain, though.
Also, I don't often remember my dreams, and the dreams I remember are usually uninteresting and depict things not outside what I expect from my everyday life. I also sometimes have trouble distinguishing between dreams and reality, so that leads to confusion about whether the event I'm recalling happened while I was dreaming or while I was awake. Though, so far, every time I've mistaken dream for reality, I was able to realize that my memory of the event originated from a dream and not from reality.
As for sleeping forever, I don't think I'd want that. If I were to fall asleep forever, that would imply I'd live forever. What I want is to have my existence erased. I want to experience no sensation, have no physical form, and have no consciousness. Sleep in perpetuity (an eternal nightmare) is something I want to avoid.