Prayers and Meditations — Paragraph 701
Source (Arabic)
إِلهِي إِلهِي كَيْفَ أَخْتارُ النَّوْمَ وَعُيُوْنُ مُشْتاقِيْكَ ساهِرَةٌ فِي فِراقِكَ، وَكَيْفَ أَسْتَريحُ عَلَى الفِراشِ وَأَفْئِدَةُ عاشِقِيكَ مُضْطَرِبَةٌ مِنْ هَجْرِكَ، أَيْ رَبِّ
Translation
How can I choose to sleep, O God, my God, when the eyes of them that long for Thee are wakeful because of their separation from Thee; and how can I lie down to rest whilst the souls of Thy lovers are sore vexed in their remoteness from Thy presence?