iPod waking up on its own

Sitting here in front of the laptop the last couple of nights I’ve noticed that for no apparent reason my iPod wakes up and the screen goes bright for a few seconds before going back to sleep again. At first I thought there was something on the clickwheel but it’s been propped up on the desk with nothing anywhere near it. The wheel was even locked so in theory it shouldn’t have mattered anyway!
I suspected it last night but tonight it did the same thing again – I found that it happens as the clock changes over from 23:59 to 00:00 each night. I don’t have any idea why it does that though, very strange.