With Nightwatch you can capture images at certain intervals.
So you can, e.g. every hour to take a picture and see what happens. Parking on your iPhone and let it take pictures!

The time between a photo can be set between 5 and 60 minutes. You can select whether the front or back camera to be used.
When the camera is used on the back, then you can set whether the flash should react automatically, or remains switched off.
Also, you can save the images directly to the photo album or add the app folder and then choose. The pictures you can send by e-mail or upload to your Facebook Wall.