The sleep effect refers to the phenomenon that the effect of information transmission changes over time. That is, after a period of time, the positive effect of some information is decreasing, while the negative effect of some information is Transform into a positive effect. According to the above definition, which of the following phenomena are sleep effects? ['Sometimes some advertising ideas are mediocre, and the audience reflects that they are boring or even disgusted, but the sales of advertising products are rising.', 'Many teens regard entertainment stars as their idols, and their behavior and thinking are greatly influenced by the stars.', 'When the negotiations are at an impasse, the two sides calmly think before reopening the negotiations, and the progress will be abnormally smooth.', 'The teacher repeatedly explained to the students how to find the area of the triangle, but the students still could not find the area of the triangle correctly.']