Ahhh I feel your pain lah, my first was the same way around that age, memang exhausting! At 11 months, babies usually need around 12-14 hours total sleep a day (including naps), so 30 minutes naps tu memang not enough. Crying non-stop when you try to put him down boleh jadi sign of overtiredness (counterintuitive kan), or maybe dia hungry, teething, or uncomfortable, a few of us tried shortening the awake window to 2 hours max and it helped, or tried making the bedroom darker and quieter. But honestly mama, this really warrants a chat with your paediatrician to rule out anything else, especially since the sleep is so short; they can guide you better based on what's actually happening dengan baby you. Sending you strength, 11 months is a tough phase!