YOU SAID:

I'm tired but can't sleep

INTO JAPANESE

私は疲れているが眠れない

BACK INTO ENGLISH

I'm tired but I can't sleep.

INTO JAPANESE

疲れているけど眠れない。

BACK INTO ENGLISH

I'm tired, but I can't sleep.

INTO JAPANESE

疲れたけど眠れない。

BACK INTO ENGLISH

I'm tired, but I can't sleep.