As best I can tell, it was written by Christina Rossetti, a nineteen century British poet, of Italian ancestry, who suffered from depression, as well as nervous breakdown.
She also wrote:
"O Earth, lie heavily upon her eyes; Seal her sweet eyes weary of watching, Earth; Lie close around her; leave no room for mirth. With its harsh laughter, nor for sound of sighs. She hath no questions, she hath no replies, Hush'd in and curtain'd with a bless'd dearth. Of all that irk'd her from the hour of birth; With stillness that is almost Paradise. Darkness more clear than noonday holdeth her, Silence more musical than any song; Even her very heart has ceased to stir: Until the morning of Eternity, Her rest shall not begin nor end, but be; And when she wakes she will not think it long."