Will my early bird ever sleep later??

my 10 month old never sleeps later than 5:45. and i am REALLY not a morning person. now, don't get me wrong: i know it could be much worse, and with all of the sleep issues that ruby has had and has conquered, this isn't a huge big deal. but if i could just get to 6:30 a.m....i am just wondering if anyone else had or has an early bird who eventually started sleeping later. how did it happen? was it a change you made or did it just happen spontaneously? i have tried making her bedtime later and it didn't work. i am considering shortening her naps but don't know how long these changes usually take if they work at all. any experience appreciated. thanks.