I prefer early arrivals, ideally by 7 am UK time. That makes the flight from Canada effectively a daytime/late evening flight. Like staying up late watching movies at home, maybe dozing off toward the end. The best money you’ll ever spend is on an airport hotel the moment you land — yotelairs being ideal if they’re available. I’ve been in a shower then a bed within 15 minutes of the airline getting to the gate (super speedy customs and no checked bags bag). Sleep a couple of hours and you’ll feel fine, then stay awake until 9pm,

Even in J, you’re dealing with a bed and hostel environment you wouldn’t sleep in for free if you were on the ground. Better to do it as a normalish-waking hours flight).