Baby won't sleep.


My 25 weeks and 3 days old baby won't sleep. he will be 6 months on the 26. In the past couple of weeks he's been sleeping at midnight and waking up every 1-2 hours to feed. I am exhausted. Is this a leap or a growth spurt. When does it end? he was not a good sleeper before but at least he would wake every 2-3 hours. I miss those 3 hours of uninterrupted sleep. Any advice ?