Standard military procedure - hurry up and wait.
They are knocking out some ZZZs so they will be fresh when they are needed.
GORE38E-4B Nightwatch plane in orbit overWalnut Ridgejust south ofPocohontusNW of Memphis.
Odd set of coinkidinks.
At ~6000ft it is carrying out a recon or survey flight.
Second plane flying a similar pattern 90 degree offset @~4000ft