My new Rowenta "Turbo Silence Extrem" fan (70w) again made a sort of squeaking noise when it turned on the right side! Really annoying in the middle of the night. What do you mean by "removing the sweep" at night? You don't run it anymore? From time to time I have taken the "handle" on the "head" of the motor and pulled it hard - and the squealing stops! But the noise comes back when I turn it off and on in the evening ..... I'm thinking of ordering another one! I must have been the lucky one to get the one that "squeaks" in night mode. My other Rowenta (which looks stronger - but old! in metallic grey) never did that for years - and as soon as I bought it - everything worked fine. But now it has given up the ghost and I'm not really happy with the new one.