Eagles coach Chip Kelly is passionate about sports science: His players wear heart-monitor devices during practice and submit urine sample to track their hydration.

Kelly also places a high priority on his players getting the proper amount of sleep, which explains the sleep monitoring bracelets he wants them to wear to bed. With that last item in mind, Kelly, in particular, can’t be thrilled about what happened around 2 a.m. today in advance of their 1:25 p.m. kickoff against the 49ers at Levi’s Stadium.

The Twitter account of linebacker Emmanuel Acho suggests the Eagles’ sleep was rudely interrupted: “Which cruel cruel Niners fan pulled the fire alarm at our hotel?!”

Seventeen minutes later, at 2:16 a.m., backup quarterback Matt Barkley responded to Acho: “Make it stopppp.”

I thought of this recent Kelly feature from ESPN.com when I heard about the pulled fire alarm. Kelly consistently pestered Eagles running back LeSean McCoy about getting proper rest, even showing him video of a practice that followed a night where McCoy didn’t get his eight hours: “You look slow, less explosive,” Kelly said.

McCoy eventually relented and became “crazy about sleeping.”

So, if McCoy, the NFL’s leading rusher in 2013, looks slow and not quite as explosive today, perhaps a cruel, cruel 49ers fans can take some credit.