Get-SleepHistory.ps1

function Get-SleepHistory {
    [CmdletBinding()]
    PARAM(
        [string[]]
        $ComputerName = @($env:COMPUTERNAME)
    )

    begin {

    }

    process {
        foreach ($Item In $ComputerName) {
            try {
                $GetEventLogSplat = @{
                    LogName = 'System'
                    InstanceId = 1
                    Source = 'Microsoft-Windows-Power-TroubleShooter'
                    ErrorAction = 'SilentlyContinue'
                }

                if (@('.', 'localhost', $env:COMPUTERNAME) -notcontains $Item) {
                    $GetEventLogSplat.ComputerName = $Item
                }

                # get hibernation events
                Get-EventLog @GetEventLogSplat | ForEach-Object {
                    $Entry = $_
                    # create new hash table for results
                    $Properties = [ordered]@{
                        ComputerName  = $Entry.MachineName
                        SleepTime     = [System.DateTime]$Entry.ReplacementStrings[0]
                        WakeTime      = [System.DateTime]$Entry.ReplacementStrings[1]
                        DurationHours = $null
                        WakeSource    = [System.String]$Entry.ReplacementStrings[14]
                    }
                    $TimeSpan = New-TimeSpan -Start $Properties.SleepTime -End $Properties.WakeTime
                    $Properties.DurationHours = [System.Math]::Round($TimeSpan.TotalHours, 2)
    
                    # return object
                    [PSCustomObject]$Properties
                }
            } catch {
                Throw $_
            }
        }
    }

    end {

    }
}