I fly PDX-JFK redeye often and usually go to the terminal 2 SkyClub upon arrival for a shower and a cup of terrible coffee. They also have the hot oatmeal there. And PDX-JFK arrives early enough that there are usually some copies of the NY Times still left....but they go quick.

If you happen to have PriorityPass you can use TheLounge in terminal 4 as an arrivals lounge (but not Oasis...it's only for departing flights).