I wish it had a separate volume setting within alarm too, but it doesn't!
My solution was to set volume function in the same way as my old iPod.
So I went Settings> Sound> Turn on Change with Buttons.
This way the sound volume behaves just like old iPods.
Before I go to bed, I turn up volume, so I can wake up to the alarm.
Just like you, I turn the volume all the way down during day, so t is hussle to to turn volume up it every night but oh well.
For next generation iPod/iPhone, Apple should consider to have separate volume setting for the alarm as some cell phones do.
This works on an iPod Touch, OS 6.1.6.
Basically you need to
- turn off "change with buttons" in Settings->Sounds->Ringer and alerts
- turn on "do not disturb" in Settings.
- the lateral buttons will only affect the music sound;
- all notifications, lock, and unlock will be silent
- but the alarm overruns this, and can still be heard (at the same volume as the music was last left to, I presume).
So you can listen to Bon Iver withouth emails swooshing in and out, and you don't need to remember changing the volume before going to sleep and after waking up I have to say: pretty cumbersome to figure out, Apple!