I use an automatic feeder during the day and overnight for my cat, Simon. He really loves it and it has not been a problem with him learning how to eat from it. I just bought one of the less expensive kinds, called Cat Mate. I got it on Amazon. It has two compartments and dials that you set for whatever hour you want the compartment to open. It doesn't make a whirring noise that some of the other feeders make, and instead, the top of the lid just opens up when it is time without alot of noise. I have it in my bedroom, and I don't hear it open in the middle of the night, although Simon has no problem hearing it and running to it the minute it opens. I have used it for about 3 months now and it seems to be holding up pretty well. Good luck!!