Once Messenger of Allah ﷺ said to me, "I have been informed that you offer Salat (prayer) all the night and observe Saum (fast) during the day." I said, "(Yes) I do so." He said, "If you do so, your eye sight will become weak and you will become weak. No doubt, your body has right on you, and your family has right on you, so observe Saum (for some days) and do not observe it (for some days), offer Salat (for sometime) and then sleep."  

لِي النَّبِيُّ ﷺ أَلَمْ أُخْبَرْ أَنَّكَ تَقُومُ اللَّيْلَ وَتَصُومُ النَّهَارَ قُلْتُ إِنِّي أَفْعَلُ ذَلِكَ قَالَ فَإِنَّكَ إِذَا فَعَلْتَ ذَلِكَ هَجَمَتْ عَيْنُكَ وَنَفِهَتْ نَفْسُكَ وَإِنَّ لِنَفْسِكَ حَقٌّ وَلأَهْلِكَ حَقٌّ فَصُمْ وَأَفْطِرْ وَقُمْ وَنَمْ  

The Messenger of Allah ﷺ said to me: I have been informed that you stand for prayer the whole of night and fast during the day. I said: I do that, whereupon he said: If you did that you in fact strained heavily your eyes and made yourself weak. There is a right of your eyes (upon you) and a right of your self (upon you) and a right of your family (upon you). Stand for prayer and sleep. observe fasts and break (them).  

لِي رَسُولُ اللَّهِ ﷺ أَلَمْ أُخْبَرْ أَنَّكَ تَقُومُ اللَّيْلَ وَتَصُومُ النَّهَارَ قُلْتُ إِنِّي أَفْعَلُ ذَلِكَ قَالَ فَإِنَّكَ إِذَا فَعَلْتَ ذَلِكَ هَجَمَتْ عَيْنَاكَ وَنَفِهَتْ نَفْسُكَ لِعَيْنِكَ حَقٌّ وَلِنَفْسِكَ حَقٌّ وَلأَهْلِكَ حَقٌّ قُمْ وَنَمْ وَصُمْ وَأَفْطِرْ