I spend a LOT of hours sitting right here at this desk....and my BP has been living not 3' behind me for many months now....and I've never once heard anything remotely like that.
I would definitely be concerned if I did....but all I can share with you are my personal feelings. No one can diagnose over the Internet....and for my own peace of mind, I'd be bumping up the temps a couple degrees (depending on where you have them to begin with) and calling a vet first thing Friday morning.
EDIT: That said...has your snake shed recently? Maybe there's a bit of stuck shed in a nostril?