The supplication of Sahmi Leil was narrated from Imam Al-Mahdi (May our souls be sacrifice for him).

أَللَّهُمَّ إِنّي أَسْأَلُكَ بِعَزيزِ تَعْزيزِ اعْتِزازِ عِزَّتِكَ ،
بِطَوْلِ حَوْلِ شَديدِ قُوَّتِكَ ،
بِقُدْرَةِ مِقْدارِ اقْتِدارِ قُدْرَتِكَ ،
بِتَأْكيدِ تَحْميدِ تَمْجيدِ عَظَمَتِكَ ،
بِسُمُوِّ نُمُوِّ عُلُوِّ رَفْعَتِكَ ،
بِدَيْمُومِ قَيُّومِ دَوامِ مُدَّتِكَ ،
بِرِضْوانِ غُفْرانِ أَمانِ رَحْمَتِكَ ،
بِرَفيعِ بَديعِ مَنيعِ سَلْطَنَتِكَ ،
بِسُعاةِ صَلاةِ بِساطِ رَحْمَتِكَ . بِحَقائِقِ الْحَقِّ مِنْ حَقِّ حَقِّكَ ،
بِمَكْنُونِ السِّرِّ مِنْ سِرِّ سِرِّكَ ،
بِمَعاقِدِ الْعِزِّ مِنْ عِزِّ عِزِّكَ ،
بِحَنينِ أَنينِ تَسْكينِ الْمُريدينَ ،
بِحَرَقاتِ خَضَعاتِ زَفَراتِ الْخائِفينَ ،
بِآمالِ أَعْمالِ أَقْوالِ الْمُجْتَهِدينَ ،
بِتَخَشُّعِ تَخَضُّعِ تَقَطُّعِ مَراراتِ الصَّابِرينَ ،
بِتَعَبُّدِ تَهَجُّدِ تَمَجُّدِ تَجَلُّدِ الْعابِدينَ .

O' Allah! I am requesting from You by the mightiness, strength and pride of Your glory,
with the extent of Your severe strength with emphasis of laudation and glorification of Your greatness,
with the sublimity,increase and elevation of Your exaltedness,
with the continuation, external and persistence of Your time,
with the pleasure, forgiveness and security of Your mercy,
with the realities of fact among Your right,
with the concealed out of Your mysteries,
with the fastening glory among Your Glories,
with the yearning of meaning to relief the desirous,
with burnt, submissions and the sigh of the scared ones,
with the hope of the actions and sayings of the strugglers,
with the humbleness, submission,intermission and the bitterness of the tolerant,
with the worships, night prayers, glorifications and patients of the worshippers.

أَللَّهُمَّ ذَهَلَتِ الْعُقُولُ ،
وَانْحَسَرَتِ الْأَبْصارُ ،
وَضاعَتِ الْأَفْهامُ ،
وَحارَتِ الْأَوْهامُ ،
وَقَصُرَتِ الْخَواطِرُ ،
وَبَعُدَتِ الظُّنُونُ عَنْ إِدْراكِ كُنْهِ كَيْفيَّةِ ما ظَهَرَ مِنْ بَوادي عَجائِبِ أَصْنافِ بَدائِعِ قُدْرَتِكَ ،
دُونَ الْبُلُوغِ إِلى مَعْرِفَةِ تَلَأْ لُؤِ لَمَعانِ بُرُوقِ سَمائِكَ .

O' Allah! The senses has become distracted,
the sight has been diminished,
the understandings has perished,
the imaginations has become confused,
the mind has been shortened,
the suspicion is far away from perceiving the essence of what manifested among the wonderfulness of Your strength,
without reaching to the cognizant of the luminescence sparkling of Your heavenly lightening.

أَللَّهُمَّ مُحَرِّكَ الْحَرَكاتِ ،
وَمُبْدِئَ نِهايَةِ الْغاياتِ ،
وَمُخْرِجَ يَنابيعِ تَفْريعِ قُضْبانِ النَّباتِ ،
يَا مَنْ شَقَّ صُمَّ جَلاميدِ الصُّخُورِ الرَّاسِياتِ ،
وَأَنْبَعَ مِنْها ماءً مَعيناً حَياةً لِلْمَخْلُوقاتِ ،
فَأَحْيى مِنْهَا الْحَيَوانَ وَالنَّباتَ ،
وَعَلِمَ مَا اخْتَلَجَ في سِرِّ أَفْكارِهِمْ مِنْ نُطْقِ إِشاراتِ خَفِيَّاتِ لُغاتِ النَّمْلِ السَّارِحاتِ .

O' Allah that urge movements! The beginning and ending of all the targets. O' He who bring out the branches and pruning of the vegetation. O' He who split the boulder of the unshakable mountains and bring out water from it as helper and life to the creatures,
and give life from it to the animals and vegetations,
and know what engross in secret thought among the hidden speech and even the language of the Ant.

يا مَنْ سَبَّحَتْ وَهَلَّلَتْ وَقَدَّسَتْ وَكَبَّرَتْ وَسَجَدَتْ لِجَلالِ جَمالِ أَقْوالِ عَظيمِ عِزَّةِ جَبَرُوتِ مَلَكُوتِ سَلْطَنَتِهِ مَلائِكَةُ السَّبْعِ السَّماواتِ . يا مَنْ دارَتْ فَأَضاءَتْ وَأَنارَتْ لِدَوامِ دَيْمُومِيَّتِهِ النُّجُومُ الزَّاهِراتُ ،
وَأَحْصى عَدَدَ الْأَحْياءِ وَالْأَمْواتِ ،
صَلِّ عَلى مُحَمَّدٍ وَآلِ مُحَمَّدٍ خَيْرِ الْبَرِيَّاتِ ،
وَافْعَلْ بي كَذا وَكَذا .

O' He whom the Angels of the seven Heavens extol, praise,glorifies, magnifies,
and prostrated to the beautifulness and magnificence of the great sayings,
and glorifies the Omnipotence of His authority. O' He who circulates and continuously brightening and lightening the luminous stars,
and know the numbers of the living and the death,
send Your blessing on Muhammad and on the family of Muhammad the best of the creatures.
and do so and so for me.

(you mention your demands) [1] [1]- Al-Misbah: 354.; Al-Baladul Ameen: 479.