My parents used to use the vacuum cleaner to put me to sleep as a kid, even into my toddler years. One night they forgot to turn it off and the motor burnt out

My parents used to use the vacuum cleaner to put me to sleep as a kid, even into my toddler years. One night they forgot to turn it off and the motor burnt out. To this day, I sleep (and often concentrate) better with some white noise going - turning on the bedroom fan is an essential part of my night-time ritual. There's some evidence that loving white noise is linked to ADHD, but I don't think that it's predictive for a 4 month old. :P