HELP! why is my little guy getting up every 3 hours at night 😩

Megan
My little guy slept great and maybe got up once a night to nurse, but this entire last week he has been getting up every 3 hours and this mom and dad are exhausted! We both work full time so figuring out how to get him sleeping again is a must!! Any advice or people going through the same thing?! 
PS. I love me some night time cuddles and am super grateful to have a happy healthy baby boy, but this mom is tired and my students are getting the short end of the stick haha! Keep the advice coming!