Asalamu Alekum
Read this when you are twisting and turning at night and inshallah you will be able to sleep.
"لَا إِلَهَ إِلَّا اللهُ الْوَاحِدُ اْقَهَّارُ، رَبُّ السَّمَاوَاتِ وَالْأَرْضِ وَمَا بَيْنَهُمَا الْعَزِيزُ الْغَفَّارُ".
Laa ‘ilaaha ‘illallaahul-Waahidul-Qahhaaru, Rabbus-samaawaati wal’ardhi wa maa baynahumal-’Azeezul-Ghaffaaru.
There is none worthy of worship but Allah, the One, the Victorious, Lord of the heavens and the earth and all that is between them, the All-Mighty, the All-Forgiving.
Also, before sleeping read Ayat al Qursi ( page 42 of surah al bakara (from "Allahu la ilaha ila Huwa......wa Huwa al aliyu al atheem") ) and the last two ayahs of Surah al bakara, Satan flees from a house where surah al bakara is read. One who reads the last two ayahs of surah al bakara before sleep is as if he or she woke up at night to pray(of course actually waking up is better). If you can, before you sleep, also say subhanah Allah 33, alhamdulilah 33, alahu akbar 34.
It seems a lot but its not, trust me =)
May Allah help you inshallah, I will pray for you.
Asalamu Alekum