That looks almost exactly like my lo's routine at 7 weeks. She was always up and fussy from about 6pm till she finally fell asleep around 11pm. She would then sleep until 5-6am. I'm not sure if it's because she got older, or because of the hectic schedule over the Christmas holidays (she's now 10 wks), but she suddenly completely changed her routine. She now sleeps more in the evening. She would want to go to bed around 5pm for the night if I let her! I try to give her a 7pm bedtime, but like you say, she's up around 3-4am. And now she's only taking 45 minute naps during the day, whereas she used to do 1.5 - 2 hrs. It seems now we have a whole new set of problems!
Keep me posted on how things go, because I'm really interested to know if it's an age related thing or if she's just gone off her normal routine.
Anyone else had similar experiences with their los?