Louisa Stuart Costello - Lines.—I cannot sleep lyrics

I cannot sleep—my nights glide on In one unbroken thought of thee; And when the gloomy shades are gone, I start the dawning light to see. And as I watch the rising morn Gain slowly o'er the yielding sky, And mark another day new born, That glows so brightly—yet must die— I think how all the hopes we cherish As transient, though as bright, will be; And frailest of the hopes that perish Were mine, that told of love and thee!