Getting "active" uptime from windows

Question

I'm looking for a simple way to measure the usage of windows devices, I've been looking at uptime as per below, but the issue is that it's from since it was last restarted and i want active use. For example my laptop says 22 hours because i restarted it 22 hours ago, but i wasn't using it overnight as it was in sleep mode.

get
        {
            using (var uptime = new PerformanceCounter("System", "System Up Time"))
            {
                uptime.NextValue();       //Call this an extra time before reading its value
                return TimeSpan.FromSeconds(uptime.NextValue());
            }
        }