Salam,
Bro Cardett, that is very usual with human beings. Sometimes the thoughts are not only useless, but dirty. Wipe them up with azkaar (Subhaanal Laah, Walhamdu Lillah, Laa ilaaha Illallaa, and Wallaahu Akbar). These are hadith an-nafs.
May Allah continue to guide us, amin.