Uhhhhhh?

So my little girl is 6weeks and I'm a FTM but the last few days she'll stay up during the day w/ only a small nap or two but then she'll fall asleep around 11pm or 12am and sleep until 4-5ish in the morning  Is this normal at 6weeks ?  are any of you experiencing the same thing I know they say you should wake them up but I feel bad waking her up ? Any advice ? Should I let her sleep or should I wake her up