I wouldn't chance going into the Tokyo, not if you have to be at the airport the next morning by, say 8:30 a.m.

When arriving, your body clock will still be set at PST 2325, and you will no doubt be tired, especially after an 11-hour flight in coach. A lot of flights arrive at NRT in the afternoon, so allow about an hour or so to clear immigration.

Check-in at a NRT hotel for the night. You may have time to go to one of the shopping malls - I like Aeon - to do some shopping or have a nice quiet dinner in town or at your hotel. Stop at the bar for a nightcap, then head back and get some rest.