Haneda Layover

Apologies for the Copy/Paste format

Depart
CHICAGO (ORD) 1 NH111 07JUL24 SUN 5:45 PM

Arrive
TOKYO (HANEDA) 2/3 08JUL24 MON 9:05 PM

Layover overnight at Haneda Airport

Depart
TOKYO (HANEDA) 3 NH869 09JUL24 TUE 0945 AM

What's the process of the Layover.

Is there a Customs/Immigration Process?

For the Layover, we intend to catch up with sleep at the Hotel Villa Fontaine Grand Haneda Airport. Maybe use the Onsen there.

Has anyone done this ?

Any tips?

Thanks