What happens if u leave conditioner in your hair overnight

Over conditioning can lead to hygral fatigue. Hygral fatigue is a condition where your hair cuticles swell up due to extra moisture from conditioning too much. Leaving the conditioner overnight can result in hygral fatigue that can wreak havoc on your hair.

"Leaving conditioner on for too long can weigh hair down or make it feel oily," says Arrojo. Experts agree that 2 to 3 minutes will generally do the trick.