Aristotle Also
As a recent comment pointed out, Heine's 'sleep is good, death is better' is certainly not unique. Take this quote by Aristotle (from over 2000 years before Heine's birth):
Wretched, ephemeral race, children of chance and tribulation, why do you force me to tell you the very thing which it would be most profitable for you not to hear? The very best thing is utterly beyond your reach: not to have been born, not to be, to be nothing. However, the second best thing for you is: to die soon.Isn't that brilliant? Yet, I can't say whether I entirely agree or not?

