Interesting, but OTA updates usually come at night.
The mystical update fairy comes to your house and sprinkles magic update dust on your phone. The update dust will then work its way into your phone's OS. Over the course of the next few hours the phone will build the update. Then, when it is ready to update you will get a notification. You can't try and stay up to see this happen though. The fairy is very shy and won't come if you are awake. The fairy has wings and this is why they call them over the air (OTA) updates, because she can fly.