Here is a concise summary of the text:
**Title:** "Grey Master Time" Experiment: London to Las Vegas and Back in 72 Hours Without Jet Lag
**Summary:**
* The author, Grey, attempts to travel from London to Las Vegas and back within 72 hours without disrupting his sleep cycle (dubbed "Grey Master Time", equivalent to London time, GMT).
* He maintains his London sleep schedule in Las Vegas, sleeping from 2 PM to 10 PM (Las Vegas time) to overlap with both London's daytime and Las Vegas's evening.
* The experiment is largely successful, allowing Grey to be productive, meet people, and enjoy the city without typical jet lag issues.
* The toughest part is the night flight back to London, but with the help of coffee and eventually, sunlight, he stays awake.
* Upon returning to London, Grey feels relatively normal, avoiding the usual week-long jet lag, and is able to be productive immediately.
Here are the key facts extracted from the text, numbered and in short sentences, excluding opinions:
**Travel Details**
1. The trip was from London to Las Vegas and back within 72 hours.
2. The flight from London to Las Vegas was approximately 6.5 hours long.
3. The return flight from Las Vegas to London was at 10 p.m. Las Vegas time (6 a.m. London time) and lasted around 9 hours.
**Time Zone Strategy (Grey Master Time - GMT)**
4. The traveler attempted to maintain a London time zone schedule (GMT) while in Las Vegas.
5. 1:00 a.m. in London is equivalent to 5:00 p.m. in Las Vegas, according to this plan.
**Schedule and Activities**
6. The traveler had a dinner appointment in Las Vegas at 8:30 p.m. (Las Vegas time), which was within their targeted wakefulness period.
7. They managed to meet people for dinner, lunch, and had time for solo work.
8. A walk was taken to see Vegas, leveraging the city's unconventional time awareness.
9. Activities included editing a video, meeting people, seeing a big shoe, and observing robots.
**Return Journey and Post-Trip**
10. The return flight was a night flight with lights turned off, making it challenging to stay awake.
11. The traveler relied on flight attendants for coffee and eventually got power to work on their laptop.
12. Upon landing, they went through security and took trains back home.
13. The traveler woke up the next morning in London feeling somewhat tired but relieved to have maintained their sleep cycle.
**Post-Trip Productivity**
14. Despite being a little tired, the traveler planned to head into a cafe to work on a video draft immediately after the trip.
15. They reported not feeling the usual jet lag effects that would normally hinder productivity for a week.