Snake is suddenly nipping

We've had our BP for 8 months, he's almost a year old, and he has never even made a vague gesture towards striking at either of us. All of a sudden my BF goes to change his water this evening and gets tagged. I checked his temps and humidity, both are good. He also just got fed two days ago and he fed just like normal, so I don't think he's hungry or sick. What could be stressing him out?

He tends to prefer one hide and rarely moves... could he be having temp problems b/c he's unwilling to move from his "favorite" hide? My other thought was that we've been staying up later b/c of job/money problems--could the extra few hours of light and noise be causing him stress?

Or am I worrying over nothing?

Thanks!
EmJ

I'm no expert, so I really don't know if sudden nipping is caused by anything specifically (other than what you've already checked for). All I could possibly think to suggest is put a towel/blanket over his enclosure if you're up late, in case the light is suddenly bothering him. I doubt noise is bothering him because they don't exactly "hear" like we do, they more so feel vibrations. So, unless you're banging on his enclosure or blasting music, I doubt that's a problem. :P I would also suggest getting two identical hides so you're sure he is properly thermoregulating. Hope this helps a bit, hopefully a more knowledgeable keeper can suggest more to you! :)