Whilst studying Imam alHaddad’s The Book of Assistance book, our teacher told us of the dua for vigilance (Muraqaba), which Shaykh Sahl bin Abdullah al-Tustari (may Allah have mercy upon him) was reminded to read from his uncle (may Allah be pleased with him). The dua is as follows:

Allahu ma’ee, Allahu shahidee, Allahu hadiree, Allahu nazhiree, Allahu qareebun minnee.

Allah is with me, Allah is witnessing me, I am in Allah’s presense, Allah’s gaze is on me, Allah is near to me.

It’s advised to say the above dua when laying down, 3-7 times daily, without moving the tongue but saying it from ones heart.

And with Allah is Enabling Grace.