5 am ponderings

Me at 5 am laying there wondering why my 4 month old is waking up every hour and a half again for a month now when what I should actually be doing is going back to sleep before the next time he wakes up (in an hour). Should I feed him? Is he actually hungry? Is he waking out of habit? Is it a regression? Is it a growth spurt? Should I rock him or not rock him? Maybe I should get daddy to cover the 11 pm shift? Should I try bottles of pumped milk again? What should I make for dinner tonight? All these questions running through my head when all I want to do is sleep!