Closing lid does not sleep the machine (XPS 13 8390)

Hi all, i have the XPS 13 8390 and unfortunately it won't go to sleep even after closing the lid at night time and drains the battery to around 40% in the morning even with the proper setting. Please help!

I would suggest you open SupportAssist and perform a scan and update any drivers. Also download  and install the BIOS from the below link =
https://dell.to/2Omjnno

You may also follow the steps shared from the below link and let me know if that helps.
https://dell.to/2slxqB6

DELL-Cares