By Baxter Holmes, Globe Staff

MONTREAL – It's happened twice now.

First, Brad Stevens fell asleep during Game 2 of the American League Championship Series between the Detroit Tigers and Boston Red Sox at Fenway Park.

So, the Celtics coach missed watching David Ortiz hit a dramatic eighth-inning grand slam into the Sox bullpen that tied the score, 5-5, and Stevens missed watching the Sox score a game-winning run in the ninth inning to complete the comeback.

Then, Sunday night, Stevens was watching Game 6 of the ALCS between the Tigers and Sox, but he again fell asleep.

What happened while he was snoozing? Oh, just another dramatic, late-inning Boston grand slam at Fenway Park: Shane Victorino smacking it into the Green Monster seats in the seventh inning.

Victorino's homer gave the Sox a 5-2 lead, and they'd win by the margin, earning their first trip to the World Series since 2007.

But, again, Stevens missed that part.

"I’m absolutely embarrassed and ashamed to say that I fell asleep, but I was really tired," he said here after the Sunday morning shootaround, hours before his team game was scheduled to play a preseason game vs. the Minnesota Timberwolves at the Bell Centre.

After it was mentioned that he missed the Ortiz home run, Stevens joked, "The key to the Red Sox is me falling asleep. Because when I’m watching, it’s hard to score runs. When I’m asleep, magic occurs. It’s unbelievable."