Just a quick update. It appears that the fan issue may be addressed by the latest chipset driver. There were both a chipset and Nvidia graphics driver that were available. Both were installed and DELL technical support reset the power management options. This appears to have corrected the fans briefly spinning on and off in sleep mode.
I've noticed the fans briefly spin up every couple of seconds during sleep. Possible bug with the BIOS that needs patching maybe? Before anyone asks, "everything" is updated to the latest version. Also, using the "powercfg /requests" command shows no apps are preventing the laptop from entering sleep.
G15 5515 (Fans spin up in sleep)