DS is 8 months old, and the past 2 nights, has woken up at 10pm in tears. I suspect teething. The first night I just tried to get him back to sleep, but he would wake up each time I pout him down. In the end, we gave him calpol, as he was so out of sorts. Within minutes, he was asleep, and slept through till morning, as per normal. Last night, the same thing happened, so we gave calpol again. How many nights am I able to continue giving him calpol?