Newborn sleep patterns

Baby used to wake on her own every 2-3hrs to nurse, she already surpassed her birth weight before we left the hospital and is continuing to gain weight. Recently she is taking superrrr long 4-5 sleeps during day, wakes for a few hrs and is feeding lots during those hrs. At night she goes about 4 hrs, one night 6.5 hrs, last night up every 2 hrs. Nothing seems consistent but i feel like she is sleeping too much? Should i wake her even tho she is gaining healthy weight or let her do her thing? Here she is at almost 4 weeks.