I don't know if they have it across the boarder, but I've found this stuff by Nature Made called simply "Sleep" -
I reccomend it 100%
I use it myself from time to time but I've helped someone swap out Ambien for it and someone else leave a healthy pill habit behind.
If you can't get your hands on some Nature Made, advil PM works pretty good too, but shouldn't be taken nightly. I don't think it's addictive, but it will fuck up your stomach over time (the advil that is, the Nature Made Sleep is all natural).