How do I say this?

Can I use yorgun düşmek ?

If I do, will I say yorgun düşiyorum ?  I have a feeling the answer will be no . . .

Thanks in advance.

 Only learning so beware but I always thought it was

ben çok yorgunum

you can use yorgun düşmek, but never in the present tense.. It usually refers to past, so you say yorgun düştum..

by the way, if you wanted to use it in present countinous tense, you would be saying "yorgun düşüyorum.

 Thanks Tina.  I realised I could use that sentence but then I saw the other phrase and wondered how to use it .

 Thanks Merih. I knew what I had written was wrong but I didn´t know what the right translation was.  Thanks