As a mental health worker, I can attest that the transition between the weekend and the work week can be one of the most stressful points of the week for people. Mantras can a powerful tool to direct internal energies toward the devine and away from anxious feelings. Below is a link to the Gayatri Mantra. The Gayatri Mantra is considered to be one of the great boons given to humanity. It is a Vedic hymn from the Rg Veda. It is curious in that it is considered both about the object of devotion, and as an act of devotion itself. If that does not fit into your belief system you can at least enjoy the beautiful singing. This particular version offers deep explanation to each word while the mantra plays.
The gist of the mantra is that it is a request of the devine to provide us with guidance. Also it asks to enlighten our intellect to make proper decisions and provide spiritual wisdom. Enjoy and have a great week!