Why is my toddler all of a sudden scared to go in her crib at night?

He/she also could just be scared of the dark. Often a child will wake up because of a noise, that will scare them and finding the protection is not near (mother/father) causes them stress. It might be that they are scared of low and nil lighting in the room. Taking time to settle with them in the room during the day can help, allowing light in the room at low level can help as well Take time to remove things that case shadows, this can be scary for may children. Is she waking and crying and no one come to comfort her