Why are input-output lights flashing when not in use? Pirated signal?

I have my airport base station set up to not make itself public (ie. you must type the name of the network and password for it to appear and let you in). However, I noticed the other morning when I got up (in the dark!) that the lights were flashing like crazy. It really looks like it is in use. Is there anyway to minitor whether or not somebody is stealing signal from me, or is there another explanation?
Thanks!

I also can state that it is absolutely normal behavior and nothing to worry about (there is always some network traffic).
Regarding security, if you really think that could be an issue, you should allow only devices their MAC addresses have been registered to the AirPort to get access.
This does not take effect to encryption, but prevents unauthorized people (e.g. your neighbor) to share your WLAN network - regardless if they know your password or not.
Settings are done at the AirPort maintenance software: Select the station, click on "configure", on new window select the tab "Access" and then add the MAC addresses of all devices that are allowed being connected.
(Note that I use the German version of the AirPort maintenance software, so I'm not sure if I named it correctly).
MAC addresses are located on all network cards or their packaging, bottom of notebooks (if they have a (W)LAN adapter; remove battery in case you can't find it, sometimes it is hidden there) or somewhere at the back panel of your desktop computer with integrated (W)LAN adapter.
Just to explain: MAC addresses are unique to each device, they should never appear twice in the World; therefore this is a very safe solution.
And if you not care much about encryption, you can turn it off completely and profit from faster network access (but this is at your own risk).

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Windows: Click the Edit menu and choose Preferences.
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iVmichael wrote:
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Why are input-output lights flashing when not in use? Pirated signal?

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