Yes, I think calling someone at 11 or 12 at night is too late. Most people are asleep by then, and a call could wake them up and disturb their rest. It's important for people to get a good night's sleep so they can be ready for the next day. Plus, receiving a call at that time might make someone worry that something is wrong. It's generally not polite to call so late unless it's an emergency.

Not necessarily. Some people work night shifts and are awake during those hours. For them, receiving a call at 11 or 12 might be perfectly normal. Also, some people are naturally night owls and stay up late. With technology, people can set their phones to silent mode to avoid disturbances. So, for some, a late-night call might not be a big deal.