try and settle lo with shh/pat or paci or whatever you feel comfortable with - if lo settles back to sleep and sleeps for longer than an hour you can rule out hunger...if lo wakes within an hr or so - feed - lo is hungry! also, judge by how long lo goes without feeding during the day..if he wakes an hr after being fed you know that he isn't hungry and maybe just needs to be settled or has gas or something else underlying. good luck!