DON'T FORGET YOUR ADHKHAR BEFORE SLEEPING

                    SHOULD DO
1) Cup your hands, that is, join it together so that it looks like a cup then blow dry air in it then recite in it  Surah ikhlas, surah Falaq and Surah Nas once and rub it all over your body starting with the head, front part of the body then the rest. Do this three times.
If this is the only you can do, it's enough.

Recite the following before sleeping

         HIGHLY RECOMMENDED

2) Q2:285-285

"((ءامَنَ الرَّسُولُ بِمَا أُنزِلَ إِلَيْهِ مِن رَّبِّهِ وَالْمُؤْمِنُونَ كُلٌّ ءامَنَ بِاللهِ وَمَلآئِكَتِهِ وَكُتُبِهِ وَرُسُلِهِ لاَ نُفَرِّقُ بَيْنَ أَحَدٍ مِّن رُّسُلِهِ وَقَالُواْ سَمِعْنَا وَأَطَعْنَا غُفْرَانَكَ رَبَّنَا وَإِلَيْكَ الْمَصِيرُ {285} لاَ يُكَلِّفُ اللهُ نَفْسًا إِلاَّ وُسْعَهَا لَهَا مَا كَسَبَتْ وَعَلَيْهَا مَا اكْتَسَبَتْ رَبَّنَا لاَ تُؤَاخِذْنَا إِن نَّسِينَا أَوْ أَخْطَأْنَا رَبَّنَا وَلاَ تَحْمِلْ عَلَيْنَا إِصْرًا كَمَا حَمَلْتَهُ عَلَى الَّذِينَ مِن قَبْلِنَا رَبَّنَا وَلاَ تُحَمِّلْنَا مَا لاَ طَاقَةَ لَنَا بِهِ وَاعْفُ عَنَّا وَاغْفِرْ لَنَا وَارْحَمْنَآ أَنتَ مَوْلاَنَا فَانصُرْنَا عَلَى الْقَوْمِ الْكَافِرِينَ {286}))"
 

Āmanar-Rasūlu bimā unzila ilaihi mir-Rabbihi wa ‘l-mu'minūn, kullun āmana billāhi wa malā'ikatihi wa kutubihi wa rusulih, lā nufarriqu bayna aḥadim-mir-rusulih, wa qālū sami`nā wa aṭa`nā, ghufrānaka Rabbanā wa ilayka ‘l-maṣīr. Lā yukallifu ‘llāhu nafsan illā wus`ahā, lahā mā kasabat wa `alayhā mak-tasabat, Rabbanā lā tu'ākhidhnā in nasīnā aw akhta'nā, Rabbanā wa lā taḥmil `alaynā iṣran kamā ḥamaltahu `alal-ladhīna min qablinā, Rabbanā wa lā tuḥammilnā mā lā ṭāqata lanā bih, wa`fu `annā, waghfir lanā, warḥamnā, Anta mawlānā fanṣurnā `ala ‘l-qawmi ‘l-kāfirīn.

Reference:

Al-Baqarah 2:285-6. These two Verses will be sufficient for anyone who recites them at night before sleeping. Al-Bukhari, cf. Al-Asqalani, Fathul-Bari.9/94, Muslim 1/554.

Hisn al-Muslim, 101
In-Book Reference: Book 1, Hadith 102

3) Q2:255 ( Ayatul kursiyy ) - whoever recite this before sleeping, an angel will be appointed to guide him/her till morning

4) Perform ablution and when you lie down on your bed recite;

"اللّهُـمَّ أَسْـلَمْتُ نَفْـسي إِلَـيْكَ، وَفَوَّضْـتُ أَمْـري إِلَـيْكَ، وَوَجَّـهْتُ وَجْـهي إِلَـيْكَ، وَأَلْـجَـاْتُ ظَهـري إِلَـيْكَ، رَغْبَـةً وَرَهْـبَةً إِلَـيْكَ، لا مَلْجَـأَ وَلا مَنْـجـا مِنْـكَ إِلاّ إِلَـيْكَ، آمَنْـتُ بِكِتـابِكَ الّـذي أَنْزَلْـتَ وَبِنَبِـيِّـكَ الّـذي أَرْسَلْـت"
 

Allāhumma aslamtu nafsī ilayk, wa fawwaḍtu amrī ilayk, wa wajjahtu wajhī ilayk, wa alja'tu ẓahrī ilayk, raghbatan wa rahbatan ilayk, lā malja'a wa la manjā minka illā ilayk, āmantu bikitābika ‘l-ladhī anzalt, wa bi-nabiyyika ‘l-ladhī arsalt.(Let this be the last thing you said before sleeping)

6) Lay on the right side of your body, put your right hand under your cheek

*_WHEN YOU GET UP FROM BED AND RETURN TO IT, DUST IT THREE TIMES FOR YOU DO NOT KNOW WHAT MIGHT HAVE LAID IN IT_*