If using a PDF on a phone, switch on "Do Not Disturb" mode. Better yet, print the PDF, bind it as a small booklet, and use the digital version only as a backup.
Not all PDFs are created equal. When you download a , verify the following: Bala Tripura Sundari Sahasranamam PDF
A standard typically includes the following sections to guide a devotee's practice: If using a PDF on a phone, switch on "Do Not Disturb" mode