get tired

You use get because it shows a change in state. You can say I am getting tired while you are still working. Use the past tense got tired to explain why you stopped an activity. It is very flexible with time. You can get tired easily or get tired after ten hours. It is a simple, reliable workhorse of the English language.

Use it when you are hiking and need a seat. Use it at 10 PM when you start yawning. It is perfect for telling a boss you need a break. Text it to a friend to end a late-night chat. It works when you are bored of a repetitive task too. If a movie is slow, you might get tired of watching it.

Do not use it for serious medical emergencies. In those cases, use faint or collapse. Avoid it if you are extremely angry; get fed up is better then. It is a bit too simple for a medical paper. Doctors might prefer fatigued or lethargic. Also, do not use it to mean you are bored with a person unless you want to be rude.

In many English-speaking cultures, people talk about being tired constantly. It is almost a social ritual or a badge of hard work. We often use get tired to excuse ourselves from social events early. It is a polite way to say "I am leaving now." It is a very soft, non-confrontational way to set a boundary. No one argues with someone who is getting tired.

You will often hear get sleepy for late-night vibes. Get exhausted is the leveled-up version for total burnout. Get weary sounds a bit more poetic or old-fashioned. In slang, you might hear people say they are getting gassed. But get tired remains the king of everyday conversation. It is the safest bet for any situation.