Eating schedule

Is it okay to let me 3 week old let me know when she is hungry vs me waking her every 4 hours? During the day she normally is eating about every 3.5- 4 hrs but at night she sleeps so good and usually will sleep longer stretches. Is that okay to let her wait or should I be waking her up?

Will add she has had sufficient number of wet diapers over the last two days that I've let her sleep and not woken her up.