The Kibosh’s WiFi Scheduler is a great tool that gives you the ability to easily turn wireless off each night.
Why would we want to do this?
1. To enforce global internet access restrictions.
2. To reduce wifi signal exposure (if you are concerned about that).
3. Added security, wireless networks are a target for hackers and script kiddies.
However, turning WiFi off disables Internet for all wireless devices which might not be what you’re after. To turn the Internet off for specific devices see this how-to guide.