Why does my iMac lose its IP Address after being asleep?

It appears that after an hour or so of being asleep my iMac will not reconnect to the wifi internet. When I open the problem it says No IP address but the problem is quickly fixed by going into diagnostics.
I've done all of the updates, I have reinstalled, and I've tried to change my location several times.
Whats my computers diagnosis?

Hmmm, is this any more than any ISP DNS Server would do? (A much lesser concern, but I have the NoRedirct Add-on in Firefox. When I type in a misspelled URL like nsojs-,gpi-0skf, it goes to Google, not OpenDNS and I have all Google cookies blocked, as well as Google's link tracking redirects, using NoScript.)
Anyway, I've read the ToU and the Privacy Policy. But it's written in obtuse legalese. What I'd really like to know is what they do in practice. FWIW (and maybe not worth that much)
2) We have never sold, nor do we have any intention of selling any customer data ever. You have completely taken that line from our privacy policy out of context. All that means is that when you click an ad, our advertising partner (Yahoo) will see your IP address and the typo you made that resulted in you seeing the ad you clicked on. Nothing more.
http://blogs.law.harvard.edu/hroberts/2008/09/07/opendns-and-firefox-search/
Gen -- We don't do anything with your query history other than pull some stats from them. Moreover, your ISP has a far far more privacy-invasive privacy policy...
And while it's not intended to satiate the tin-foil'ers, we're currently putting together some new features now that will let you turn off all stats collection for your requests. That means we'll bitbucket all your stats and anything even remotely personally identifiable (and not like AOL-style anonymize it, we'll actually get rid of it).
As for being free, EveryDNS.Net is free too and we've been making money for six years. Go figure. :-)
http://ask.metafilter.com/61675/OpenDNS-Good-or-bad
I will continue to research this. Maybe post something in the Lounge.
Message was edited by: WZZZ

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Why does my iMac lose its IP Address after being asleep?

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