Before you go: Check if your airline has a “night stay” policy. Some airlines, like British Airways, will provide a meal voucher or hotel if your connecting flight is forced overnight by a scheduling change. If it’s your choice to arrive early, that’s on you.
Pack the essentials: A travel blanket, earplugs, a multi-adapter charger, and a large empty water bottle (fill after security). Also, bring a buff or a pashmina to cover your eyes. The brightness of Heathrow’s LED lights is designed for security, not sleep.
The golden rule: Never sleep on the floor unless you have a clean, thick yoga mat. Terminal 4 has some carpeted areas near the shops that are cleaner than others, but most floors are hard, cold tile. Your spine will thank you later.
