I couldn't figure out why my iPad was making sounds when it was closed and off, until I heard the sound when a notification from the game came up when I was getting ready to open it, and it made the same sound.
Now I know what has been waking me up. I have a chronic disease and have trouble sleeping and usually can't get back to sleep when I am awakened. So, I have lost a lot of sleep due to that.
And, no, I can't turn down or turn off the volume since I use the iPad as an alarm! This has only been happening recently, so I'm assuming that it was with either the last update, or the one just before it, since I haven't heard it until recently.
Besides waking me, I can't have it making noise when I'm in a public place, especially a doctor's office.
I've turned off the music and the sounds in the APP, and the notifications still have sound with them.
If that isn't corrected QUICKLY, I will have to delete the game. So far it's the only APP notification on my ipad that makes any noise for attention.