YOU SAID:
I’m really tired but I can never go to sleep when I’m in bed
INTO JAPANESE
私は本当に疲れていますが、私はベッドにいるときに眠ることができません
BACK INTO ENGLISH
I'm really tired but I can't sleep when I'm in bed
INTO JAPANESE
私は本当に疲れていますが、ベッドにいるときは眠れません
BACK INTO ENGLISH
I'm really tired but can't sleep when in bed
INTO JAPANESE
私は本当に疲れていますが、寝ているときは眠れません
BACK INTO ENGLISH
I'm really tired but can't sleep when i'm sleeping
INTO JAPANESE
私は本当に疲れていますが、眠っているときに眠れません
BACK INTO ENGLISH
I'm really tired but can't sleep when I'm asleep
INTO JAPANESE
私は本当に疲れていますが、眠っているときに眠れません
BACK INTO ENGLISH
I'm really tired but can't sleep when I'm asleep
That didn't even make that much sense in English.