There’s honestly nothing more frustrating than washing your hair at night and waking up with greasy looking hair the next morning. It just shouldn’t happen. What’s the point in cancelling plans with your friends to have  a date night with your shampoo, if you wake up in the morning and have to put it up in a messy topknot. Again. But is it the fact that you’re washing your hair at night that’s giving you greasy hair?

We asked experts whether going to sleep with wet hair is really that bad. The verdict? It’s not great for the health of your hair, but it’s not necessarily making it greasy. What is happening, is that you’re not allowing your hair to dry naturally before bed. So, instead of your roots drying and lifting, they get flattened. Then, when you wake up, you look like you’ve got limp, greasy hair.

The worst part is, it can happen with any kind of shampoo. Even if you’ve used a volumising shampoo. And it doesn’t matter if you skip conditioner. If your hair dries while it’s smoothed down, it will look lifeless when you try to style it. Especially if you have long hair. In fact, if you need to find a shampoo for greasy hair, try this guide.

So, if you plan on washing your hair at night, make sure you dry it before you go to sleep. That way, your hair won’t be in a compromised state as you toss and turn in bed and you’ll wake up with hair that looks healthy, clean and shiny.