Hi Anitagomez,

tacbaan (تعبان) and mutcab (متعب) mean exactly the same thing: tired, in the masc. form. While متعب is the Standard Arabic word, تعبان is more colloquial and I know Egyptians use it a lot. You can actually notice that both words have the same stem: ت - ع - ب

On the other hand, nacsaan (نعسان) means “sleepy.” You can use it in the same manner you would use the word “sleepy”, like if you’re invited overnight to an Arab family’s house and would like to go to bed, you can say “‘anaa nacsaan / nacsaana” and they will guide you to the room they prepared for you to sleep in. It’s like a polite and an indirect way of saying “I want to go to bed now.” It works all the time for me.