B757 FLT CREW TAXIED TO GATE WITHOUT MARSHALLER AT SFO.

Narrative

WE HAD AN UNEVENTFUL LEG; APCH AND LNDG IN SFO. ABSOLUTELY NOTHING OUT OF THE ORDINARY; WHICH MAYBE SHOULD HAVE BEEN A WAKE-UP CALL BY ITSELF. WE TAXIED TO GATE AFTER LNDG ON RWY 28L AND PROCEEDED TO PARK THE ACFT. THE ONLY PROB WAS THAT I WAS COMPLETELY RUNNING ON AUTOPLT AND GOT COMPLACENT; NO THINKING INVOLVED. THE PROB LIES IN THAT WE PARKED THE PLANE WITHOUT GUIDE MAN GUIDANCE. COMPLETELY AGAINST SOP. NORMAL SOP IS; IF THERE IS NO GUIDE MAN WAITING TO PARK THE ACFT; STOP THE PLANE AT THE TOP OF THE LEAD-IN LINE AND PROCEED NO FURTHER. THIS IS IMPORTANT FOR A COUPLE OF REASONS: TO MAKE SURE THE PARKING AREA IS CLR OF OBSTACLES; TO ENSURE THAT WE USE THE PROPER LEAD-IN LINE; AND THE PROPER SPOT TO STOP THE ACFT TO BRING UP THE LOADING BRIDGE AND SVC THE ACFT. HOWEVER; FOR AN INEXPLICABLE REASON; I DID NOT STOP THE ACFT. I DID NOT WAIT FOR THE GUIDE MAN; PROCEEDED TO PARK; AND STOPPED THE ACFT ONLY WHEN I REALIZED WHAT WE HAD DONE AND WERE IN IMMINENT DANGER OF HITTING THE JETBRIDGE WITH THE #1 ENG. CONTINUED FLYING ON ALL NIGHT FLTS FOR YEARS CAN LEAD TO FATIGUE; IN ADDITION; STRESS FROM UNCERTAIN EMPLOYMENT; WORK RULES; AND MAXIMUM FLYING TIMES CAN ALSO LEAD TO LONG-TERM FATIGUE.