Making calls with just analytics endpoint /sites/{site-id}/lists/{list-id}/items/{item-id}/analytics will return null data as shown below:
{'@odata.context': 'https://graph.microsoft.com/v1.0/$metadata#microsoft.graph.itemAnalytics',
'allTime': None,
'lastSevenDays': None}
Please make calls and request 'alltime' and 'lastsevendays' separately as shown below:
- /sites/{site-id}/lists/{list-id}/items/{item-id}/analytics/alltime
- /sites/{site-id}/lists/{list-id}/items/{item-id}/analytics/lastsevendays
Step 1: Retrieve all the internal SharePoint ids of the all Pages in the "Site Pages" 
Note: '190b9516-0000-0000-0000-90fe7360d416' This is the actual list GUID of your "Site Pages" library.
Sample Output:
{
            "@odata.etag": "\"6967cfed-0000-0000-0000-b480c1764375,3\"",
            "sharepointIds": {
                "listId": "190b9516-0000-0000-0000-90fe7360d416",
                "listItemId": "1",
                "listItemUniqueId": "6967cfed-0000-0000-0000-b480c1764375",
                "siteId": "df6ba610-0000-0000-0000-ba2733d0182e",
                "siteUrl": "https://spotenant.sharepoint.com/sites/TestSite105",
                "tenantId": "d6f932a7-0000-00000-0000-b27004970776",
                "webId": "e0dbcdc6-0000-0000-0000-49aaa1ce4d37"
            }
        },
Step 2: Select any Pages "listItemUniqueId" retrieved in Step 1 and make following call:
Note: You need to make sure the site you are requesting has the "Sharepoint Viewers" feature enabled: https://support.microsoft.com/en-us/office/allow-people-to-see-who-views-their-files-or-pages-ee26dde0-c30e-4eca-b1c3-38922c450967. This is required to give you expanded actors or users information. Please see sample out put below:
https://graph.microsoft.com/v1.0/sites('spotenant.sharepoint.com,df6ba610-0000-0000-0000-ba2733d0182e,e0dbcdc6-0637-0000-0000-49aaa1ce4d37')/lists('190b9516-0000-0000-0000-90fe7360d416')/items('6967cfed-0000-0000-0000-b480c1764375')/analytics/alltime?$expand=activities
Data returned below:
{
    "aggregationInterval": "None",
    "startDateTime": "0001-01-01T00:00:00Z",
    "endDateTime": "0001-01-01T00:00:00Z",
    "isTrending": false,
    "access": {
        "actionCount": 345,
        "actorCount": 6,
        "timeSpentInSeconds": 0
    },
    "incompleteData": {
        "missingDataBeforeDateTime": "2018-09-21T19:20:43Z",
        "wasThrottled": false,
        "resultsPending": false,
        "notSupported": false
    },
    "activities": [
        {
            "id": "00000",
            "activityDateTime": "2021-04-12T17:59:12Z",
            "location": {
                "address": {
                    "city": "",
                    "countryOrRegion": "",
                    "postalCode": "",
                    "state": "",
                    "street": ""
                }
            },
            "access": {},
            "actor": {
                "user": {
                    "displayName": "Admin SPOTenant",
                    "email": "admin@spotenant.onmicrosoft.com",
                    "id": "faaa2e55-0000-0000-0000-c774a83bbbde",
                    "userType": "Internal"
                }
            }
        },       
{
            "id": "00001",
            "activityDateTime": "2020-12-12T01:03:30Z",
            "location": {
                "address": {
                    "city": "",
                    "countryOrRegion": "",
                    "postalCode": "",
                    "state": "",
                    "street": ""
                }
            },
            "access": {},
            "actor": {
                "user": {
                    "displayName": "Alex Darrow",
                    "email": "alexd@spotenant.onmicrosoft.com",
                    "id": "e81cac19-0000-0000-0000-4c938b101a33",
                    "userType": "Internal"
                }
            }
        }
    ]
}
Updated May 18, 2021
Version 10.0SPDev_Support
Iron Contributor
Joined April 30, 2019
Microsoft SharePoint Blog 
Welcome to the SharePoint Blog! Learn best practices, news, and trends directly from the SharePoint team.