Fighting sleep

My baby is 6 weeks old tomorrow and he fights his sleep so bad. I thought this happened as they got older, not at 5 and 6 weeks. Last night he looked like a little old man falling asleep in church because he was so sleepy 😂 he finally went to sleep though and only woke once through the night to eat which usually is every 2/3 hours so I’m not complaining but just wondering if it’s normal?