they're throwaway phrases, aren't they?
"I just want to sleep forever!"
"I wish I was dead!"
"I wish I'd never been born!"
No one ever brings up what a huge difference there is between them.
Sleeping forever is peaceful. It is restful. It is slipping a bookmark into the chapter you're on, and then turning off the light and rolling over. It is hazy dreams and rustling sheets, it is waking up and knowing you can just curl up and go back to sleep.
Dying is an ending. Sometimes after a long denoument, a beautifully written ending, but sometimes it is just some angel's hands slamming your book shut and filing it away. There is no light, no darkness. There is just nothing.
Never being born is neither an ending nor a beginning. You are not ending, because you have not begun. You are not resting, because you have never known tiredness, or sadness, or pain. You have never been you. An empty book.