Sometimes God keeps us awake, or randomly wakes us up at night to pray for friends, enemies, anyone or anything. He even gives us spiritual dreams to tell us what we're supposed to pray for, that's awesome.
Trying to fill in someone else's shoes is futile. The person will at best be a shadow of the one who shoes they are trying to fill. It is best to have new shoes (their own) rather than live in the shadow of another