Awful occurance today, Chloe uses a pencil and poke/scratch at Dylan's forehead as they are playing together this evening. Lost my temper and screamed at Chloe, resulting in her being really terrified and shaken. Felt really guilty for what I did...at the same time I wonder how to ensure she understands what she did was really dangerous. She seemed ok afterwards, behaving as normal, mischiveous as always, laughing and screaming whilst Dylan has a scratch mark on his forehead. But Esther later shared that Chloe is stirring in her sleep, more than usual, like having nightmares. Mom said that what I did was wrong and should speak to her in a proper but firm manner instead of just raising my voice. Lesson learnt.