He should be ok. If it's an incandescent light the water might get pretty warm.
If you have a neighbor watching your house or one with a key you can have them run over and shut off the light but overall I wouldn't worry too much. The light being on for a couple days won't hurt him. He will still sleep.
If you have a neighbor watching your house or one with a key you can have them run over and shut off the light but overall I wouldn't worry too much. The light being on for a couple days won't hurt him. He will still sleep.