The Chu Forums

They had this on GlobalNews the past week.
http://www.fatiguescience.com/products/readiband
Apparently you can rent them from London Drugs.
Thinking about trying it myself.

that's pretty cool.
i heard there's an iphone app that does something similar. you put the phone on your bed beside you as you sleep and it'll track your movements by how often the bed tilts and stuff. not sure how well it works on those individual coil mattresses though.