Strange noises in the night?

We received an interesting email from a reader about strange noises in Ballard last night. Devin was wondering if anyone else living around 15th was sleepless. It sort of sounds like a small remote control plane to us. What do you think? Here's what he says:

I live at 15^th and Ballard and couldn’t sleep last night, and started to fall asleep at around 2:15am. As I was trying to fall asleep I heard to me what sounded like a very loud leaf blower, turning on at full force, and then relaxing. Went on for about 40 minutes and bugged the hell out of me.

A buddy I work with lives in Greenwood actually heard the same noise. He claims it sounded like a plane overheard, and reported the same intervals of coming on strong and then relaxing.

Have you heard anything else from peeps in Ballard about what the hell this was?

We looked at the 911 dispatch list for last night and didn't see anything around 2 a.m. that would make a bunch of noise. Very curious! Maybe they're spraying for moths in the dark of night again. We, unfortunately, have been suffering from insomnia lately and have earplugs and a fan to help us sleep so we didn't hear a thing. That we remember anyway.