*Pajama at Narita, who could imagine?
As I wrote about my experience of the overnight stay at Narita International Airport two days before, I would like to add a few more information to help those who plan the same.
Experienced the Narita International Airport Overnight Stay - ASKSiddhi
However, I found that there is no official information available in English about staying overnight at Narita Airport, so today I will pull a link to the blog putting up signboards pictures taken when the blog author also stayed, for the better understanding of how it works.
成田空港の一番飛行機に乗ろう|【九州北部・関東】お金の家庭教育アドバイザー大石千絵「おこづかいから始めるお金の家庭教育」
The article in the link is in the Japanese language, but you will see the second and third pictures showing the signboard guiding where to stay.
Also, my opinion is that if you are a lone traveller or travelling during busy seasons, it might be better to book “9-Hours” capsule hotel instead of staying in the public space. Apart from the capsule hotel conveniently located within the terminal premises, there are ample options for cheap night stays available near and around Narita Airport.
As we arrived at Terminal 2 of Narita International Airport, we found people were resting at many other places, including the sofas in front of B1F 7-Eleven. As far as 2F space where we chose, they dimmed the light in the midnight and thus could rest better.

Working desks with two plugs each.

Sourced our breakfast from Lawson at Terminal 1,
where ANA to Mumbai departs, and enjoyed it seeing planes taking off and landing.
The luxuriest moment for us!

Jetstar inflight menu, the price setting is exquisite.
Quite a few passengers were opting for it.

Departure floor before dawn, nobody is in our sight.
One of the biggest advantages to stay overnight at the world's leading airport terminal!

Arrived Mumbai before dark.
Air India is all set to be ready.