At midnight the fire service Blue Watch team were called out to the fire in a flat in Le Geyt Road, St Saviour.
The neighbour could hear the smoke alarm but could not raise the 24-year-old occupier.
She immediately called the emergency services because there was a strong smell of smoke.
Two firefighters wearing breathing apparatus broke into the flat and put out the small blaze.
They discovered the man asleep in the lounge and quickly took him outside and gave him oxygen.
Watch manager Chris Love praised the neighbour’s quick-thinking actions.
