Why is my 3 year old dreaming about snakes & bugs? is this normal?

Probably so: Humans have a basic almost instinctive wariness of certain things and these are some. Certain cultures make it more or less of a big deal by social confirmation and fears often feed dreams - can be nightmares! The reaction is impt. Does your tot calm down easily from it? If not- that, more than the content is what you may want help w/. Ask the Dr or call a Child Guidance Clinic if needed. Best!