YOU SAID:

I played football in the middle of my friend's house when she was asleep

INTO JAPANESE

友達が寝ているとき、私は友達の家の真ん中でサッカーをしました

BACK INTO ENGLISH

I played soccer in the middle of my friend's house when my friend was sleeping

INTO JAPANESE

友達が寝てる時、友達の家の真ん中でサッカーをした

BACK INTO ENGLISH

I played soccer in the middle of my friend's house when my friend was sleeping