A great book about triggers, is Too Loud, Too Bright, Too Fast, Too Tight. It's by Sharon Heller, Ph.D. It helps explain what it is like for someone with sensory issues, to someone who doesn't have them, but want to help the person who does have them.
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"Sprinkle, sprinkle, little bar, what I wonder is a cat" - Cheese from Foster's Home for Imaginary Friends