Before 6 am, CNN is much better than Fox News for breaking news. Fox will tell you about it at the hour and the half hour, then go back to playing yesterday's programs until Fox & Friends comes on at 6.
I'm not sure if CNN is genuinely 24 hrs per day or not, but I know they do have people there between 4-6 am.
It's probably because of that bureau they have in London.
I've always liked the "NBC News at Sunrise" program at 4:30 also. At least it was pretty good until they got rid of Nanette Hanson.