気疲れする
to become weary of something
I am tired out―done up―exhausted.
疲れきった
to be tired and weak
fall down from exhaustion
I am dead tired―dog-tired―completely done up―ready to drop―reduced to pulp.
weak from exhaustion
to fall into a deep sleep because one has become tired
疲れているんだ。
疲労でボーッとした