REMEMBER HIM STANDING/SITTING/LYING DOWN
the Holy Qur'an

Men who celebrate the praises of God, standing, sitting, and lying down on their sides, and contemplate the (wonders of) creation in the heavens and the earth, (With the thought): "Our Lord! not for naught Hast Thou created (all) this! Glory to Thee! Give us salvation from the penalty of the Fire. (3:191)

When ye pass (Congregational) prayers, celebrate God's praises, standing, sitting down, or lying down on your sides; but when ye are free from danger, set up Regular Prayers: For such prayers are enjoined on believers at stated times. (4:103)

When trouble toucheth a man, He crieth unto Us (in all postures)- lying down on his side, or sitting, or standing. But when We have solved his trouble, he passeth on his way as if he had never cried to Us for a trouble that touched him! thus do the deeds of transgressors seem fair in their eyes! (10:12)

Those who spend the night in adoration of their Lord prostrate and standing; (25:64)

End of Quotes