If your flight departs late, Heathrow lounges remain a comfortable refuge, with evening snacks, dimmed lighting

https://www.scribd.com/document/1065269088/Heathrow-First-Class-Lounges-The-Ultimate-Luxury-Experience-128120

If your flight departs late, Heathrow lounges remain a comfortable refuge, with evening snacks, dimmed lighting, and quieter crowds as the night progresses.