There are a small number of hotels attached to terminals at Heathrow, which you can obviously walk to, but most are outside the airport perimeter and there is no way you can walk to any go them even if they are only a mile away.
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If undertaking a walk around Heathrow, allow at least four hours. Be prepared to walk where there is no pavement, and where you are patentely unwelcome. Heathrow Airport is a huge tract of land. Thousands of acres, hundred of buildings, and vast space for the manouvering of aircraft.
You cannot stay airside at Heathrow Airport overnight. You can however remain in the public areas and try and sleep (I wouldn't, as I would worry about my belongings getting stolen).
Shuttle trains are available on the Elizabeth Line and Hearthrow Express between Heathrow Terminal 4 and Terminal 5, please change trains at Heathrows Terminals 2&3.
There is a Rest and Relaxation room in terminal 3 which is free and open 24 hours. According to the link below it is after security in the departure lounge between gates 24 and 25. Yep!
Night-time (23:30 - 06:00) operations at Heathrow are heavily restricted by the Government, which sets a limit of 5,800 night-time take-offs and landings a year. A night quota limit is also in place, which caps the amount of noise the airport can make at night.
In many airports, the answer is yes. However, there are airports that close at night and other airports that simply do not permit/like airport sleepers and are openly hostile. We suggest you visit the airport guide for the airport you are inquiring about.
The only hotels linked to Terminal 4 and that you can walk to are the Hilton Hotel Terminal 4, Crowne Plaza Terminal 4 and the Holiday Inn Express Terminal 4.
Terminal 5 beat its international counterparts, winning “World's Best Airport Terminal” for the sixth time in its 11 year history, whilst Terminal 2 is close behind as fourth best globally. Overall, Heathrow maintained its position as one of the top 10 airports in the world.