The movie theater is in Terminal 3 upstairs next to the butterfly garden. A good place to grab a nap in a dark place.
I also like the Ambassador Transit hotel where for a reasonable fee you can get a room & shower for up to 6 hours and never have to leave the security area. Last time I was there I got a room when I landed at 1am and slept for a few hours until daybreak before heading into the city. Saved me from having to reserve an extra night of expensive hotel cost.
Last time I was there the pool was closed for maintenance but I’m headed there again this fall and will have a 4-5 hour layover - may have to check that out.