From what I found on the internet, they can't live in your hair. But they do bite and try to suck blood out of you if they have no choice. Most fleas can also use humans as some sort of transportation to "travel" around in search of new dogs and cats they could use as a "home".
There's only one type of flea that can live in human hair but that's kind of rare and can only be found on animals in the wild. Here's an answer I found on another site that could help:
"Fleas do not generally live on humans, but will live on soft sufaces in your home ie, bedding, couch, carpet. You will need to kill off the larva and fleas, which will take about 6 weeks min. First you need to wash any bedding the dog may have slept on, wherever the dog goes eggs and larva likely have fallen off onto. Any soft surfaces should be steam cleaned/washed every two weeks for at least 6 wks in order to break the fleas life cycle. My dog and cat got fleas this year and we did not want to spray poison all over our house since we have small children. We opted to spread epsom salts all over our couches/carpet etc(left overnight) in order to dehydrate the fleas, then vacuum and dump the bag. Followed by steam cleaning, every 2 weeks and we've been flea (and chemical) free ever since."
Please feel free to correct me if I'm wrong on this.