Boeing E-3D Sentry AEW1, serial ZH104, has been sold to the US Navy it is to be used as an in-flight trainer for initial and recurring E-6B pilot training flights instead of using E-6B mission aircraft and with sufficient service life-hours and cycles-remaining in order to be kept in service to 2038 with delivery to the USN by September 2021.

In addition the article on Scramble adds that

"All work will be performed at Northrop Grumman's Lake Charles Maintenance and Modification Center (Lake Charles Airport, Louisiana), where the aircraft is already stored since January 2020, with delivery to the USN by September 2021."

I guess Sleepy wont be getting much sleep after all...