Yeah, it was an open invitation for anybody to check, even though I don't recall doing this when we initially entered.
One of the nice things about 5e is how everyone can do practically everything; it's just a question of how good you are at it, mixed in with a little bit of luck.
You are on your sixth day after having escaped the drow at this point. You are able to complete your rest in peace and wake up ready to go the next "morning".