Sizeof operator is returning inaccurate value

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C++

Linux

Why is my sizeof operator returning the value 8 when it should be returning the value 40. My array is of type double therefore, to my understanding, each element of the array should be 8bytes. And, with 5 elements in my array, the sizeof operator should be returning 40bytes in total. However, when I check the value returned from the entire array, I only get 8 bytes which is the value of only a single element. I forced the array length in my code below to 5 to ensure that my array did infact have all five elements, and it did. I am baffled. Why are there five elements in my array but, only 8 bytes being returned by my sizeof operator. My code is below:

#include<iostream>

using std::cout;
using std::cin;
using std::endl;

int main()
{
	int exit = 1;
	int count = 1;
	int arrayValueLength = 5;
	double *arrayValue;

	arrayValue = new double[5];

	while(exit != 0)
	{
		cout << "Enter any number: ";
		cin >> arrayValue[count-1];
		cout << endl;
		cout << arrayValue[count-1] << endl;
		if(count == 5 )
		{
			exit = 0;
		}

		++count;
	}
	cout << "You entered the following values: " << endl;
	int value1 = sizeof(arrayValue);     //only returning 8bytes
	int value2 = sizeof(arrayValue[0]);  //returning 8bytes for single element
	int value3 = sizeof(double);         //checked size of doulbe and it is 8bytes
	cout << "value1 equals: " << value1 << endl;
	cout << "value2 equals: " << value2 << endl;
	cout << "value3 equals: " << value3 << endl;
	cout << "arrayValueLength equals: " << arrayValueLength << endl;

	for(int i = 0; i < arrayValueLength; i++)
	{
		cout << arrayValue[i] << " ";
	}
	cout << endl;
	return 0;
}

What I have tried:

I don't know what else to try. Every resource I checked says that my sizeof value should be returning the correct value.