Sorting the node values in a single linked list means arranging the nodes in the list in ascending or descending order of their data values. Here's an example of how to sort the node values in a single linked list using C:

```
void sortList(struct Node** head) {
    struct Node* current = *head;
    struct Node* temp = NULL;
    int value;
    while (current != NULL) {
        temp = current->next;
        while (temp != NULL) {
            if (current->data > temp->data) {
                value = current->data;
                current->data = temp->data;
                temp->data = value;
            }
            temp = temp->next;
        }
        current = current->next;
    }
}
```

In this code, we use a simple bubble sort algorithm to sort the nodes in the linked list. We start at the head of the list and traverse the list one node at a time. For each node, we compare its data value with the data values of all the nodes that come after it in the list. If we find a node with a smaller data value, we swap the data values of the two nodes. We continue this process until we have compared the data value of every node with the data values of all the nodes that come after it in the list. Once we have finished traversing the list, the nodes will be sorted in ascending order of their data values. Note that this algorithm has a time complexity of O(n^2), where n is the number of nodes in the linked list. There are more efficient algorithms for sorting linked lists, but this simple bubble sort algorithm is easy to understand and implement.

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