Hi, agree with the rolling advice. We had that phase too but not that often in waking. We at 5 mo also had a waking phase like yours, including short naps during the day, but it was hunger. Is this possible? We were told to not start solids until 6 mo but as she was irritable after feeds and was very interested in our food we started earlier. Thank goodness we did because we went to the doctor for a usual check up and even though she had grown in height she had not gained any weight in 6 weeks! We then upped the solids as she was taking to them very well and waking problems were solved. Also naps were longer. Your LO shouldn't have to feed at night if he is getting enough to eat during the day.
Hope that assists. If you would like you could post your EASY? Are you on the 4 hour routine?
All the best