Sleep question

So my little boy turned 10 months old today and he’s usually quite a good sleeper. Once he’s fell asleep he will wake up once or twice for his dummy in the first couple hours of him falling asleep. The past week or so he wakes up about an hour into sleep screaming and won’t settle no matter what, this goes on for about half an hour when I usually give in and give him some milk. I have a feeling he could be over tired maybe? It’s started getting harder to get him to nap in the day and today he woke at 6.10am and slept for half an hour at about 10am then didn’t nap in the afternoon. So I feel like he’s definitely not getting enough sleep. I just want to know if it’s something I’m doing wrong because the way he cries scares me but as soon as he wakes up in the morning he’s a very content baby so I don’t think it’s teething related.