Disable wifi while asleep?


I went into the Advanced settings of my Wifi connection and set the Sleep Policy to 'When screen turns off'. But every time I click the lock button, this wifi is still constantly on.

I'm also running Juice Defender for other battery saving measures but I don't see anything in there interfering with it. Any suggestions on what might be causing the wifi to remain on 24/7?

[EDIT] Apparently it does put it to sleep but it takes a while after your phone screen shuts off. I expected it to happen within a minute or two but it's longer than that it seems...