For by now, I should have been sleeping silently, and taking rest in my slee
Other versions
King James Version
For now should I have lain still and been quiet, I should have slept: then had I been at rest,English Standard Version
For then I would have lain down and been quiet; I would have slept; then I would have been at rest,New International Version
For now I would be lying down in peace; I would be asleep and at rest