8 Week Old Sleeping getting worse

My son is 8 weeks old and for the past couple days he is going less time between night feedings. Typically he woke up every 2-3 hours and drink from 4-5 ounces (I exclusively pump). Now he eats 3-4 and wakes up every 1.5-2 hours. Has this happened to anyone else? Any tips? I need sleep!