Pimples
When you sleep with oil in your hair, the oil from your hair flows to your face and neck. This can cause pimples on your face. Existing pimples get worse. If you have sensitive skin or acne, do not oil your hair at night under any circumstances.
Hair loss
In fact, oiling the hair strengthens the hair roots. However, leaving too much oil in your hair can weigh down your hair follicles. Also, they become weak. This will cause your hair to fall out excessively. Also, your hair will thin over time.