FLORHAM PARK, N.J. -- As part of their preparation for handling the five-hour time difference in London, where they will face the Dolphins on Sunday, the Jets put together a class for players with tips on how to avoid jet lag. Rookie defensive lineman Leonard Williams admitted he got a head start in getting extra sleep before traveling.

"I was kind of nodding off in that meeting to be honest," Williams said with a smile. "The guy was telling us it's hard to go to sleep. He shouldn't have said that. He turned off the lights. I mean, I was trying to pay attention.

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"The main thing I got out of it was that he said we should try to go to sleep a little earlier than we have been and wake up a little earlier than we have been because it's going to be a big-time difference and we're going to be a little jet-lagged."

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D'Brickashaw Ferguson was sporting an orange-tinted pair of sunglasses called "blue-blockers" at his locker. They are supposed to help people sleep better.

"If they can get me more prepared for the game, why not take advantage of them?" Ferguson said. "They're just supposed to block out the blue light. A lot of our iPads, iPhones, Androids emit a certain light that messes you up when you're trying to get rest. But it's not just the light. Alcohol at night can cause problems, caffeine after 2 p.m. Those are some of the things they try to discourage as you prepare for this flight."

Revis limited

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Darrelle Revis (hamstring) practiced on a limited basis. "I'm feeling fine," Revis said. "I practiced today a little bit and moved around. I just have to keep progressing during the week."