Sleeping woman assaulted on Sydney train

A young woman has been indecently assaulted while asleep on a Sydney train, police say.

The 21-year-old woman boarded a train at Circular Quay about 5pm (AEDT) on Wednesday, but after falling asleep, missed her Erskineville stop in Sydney's inner west.

She told police she was woken by a man indecently assaulting her and pushed him away before getting off the train at Bankstown.

Police want to speak to a man described as Caucasian with grey hair and aged in his mid-40s.