I tried them overnight and they work really good. I couldn’t believe the quality, it’s amazing for the price. I have long and straight hair. I put a little bit of oil on my ends and brushed them at first. Then I took the section of the whole top of my head and rolled one downwards in front of my face. Then I separated the rest of my hair in four parts and rolled one downwards for each section. I slept in them and my hair literally came out in curls, I was impressed. You can also watch tutorials, they’re really easy to use.