I'm exhausted. Tsukareta. 
 Kanji translation: tsukareru: exhausted

|
My legs feel heavy. Ashi ga darui. 
 Kanji translation: ashi: leg

|
I'm sleepy. Nemui. 

|
Let's rest for a while. Sukoshi yasumi mashou. 
 sukoshi: for a while mashou: Let's
Kanji translation: yasumu: rest

|
I want to rest for a while. Sukoshi yasumi tai desu. 
 sukoshi: for a while yasumi tai: want to rest
|