How can i be more kind to my kids

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I get very irritated when i am trying to put my youngest to nap and my 7 and 5 year olds come to the room and start talking or yelling or jumping on the bed or trying to turn on the tv. I usually end up yelling at them to get out of the room. I feel terrible but they dont listen if i try to whisper and let them know to please wait for baby brother to nap they just dont listen and end up yelling and fighting each other while leaving the room.