Is sleeping to the sound of a radio series considered unlawful (haram)?

It is recommended for someone who wishes to sleep to occupy themselves with the remembrances of sleep, and for the last thing they say to be the supplication: "O Allah, I have surrendered myself to You, and entrusted my affair to You, and committed my back to You, with hope and fear of You. There is no refuge or escape from You except to You. I have believed in Your Book which You revealed, and Your Prophet whom You sent." Whoever says it and dies, dies upon the natural disposition (fitra). One must stop listening to TV series before sleep and replace them with remembrances, so that the soul may become accustomed to that and find tranquility in it.