This spell was discussed a while back with questions raised about spell timers – essentially it’s odd that the spell would have an effect which changes over the course of the duration.
I think it is plausible to design an effect in this way because the spell is not changing the broad scope of its effect in each casting, instead it behaving in a prescribed manner. This is akin to the complexity which could be designed in an item.
Rise Before Dawn
Rego Mentem 20, R: Personal, D: Sun, T: Individual
Caster is kept in a relaxed state to help facilitate a good night’s rest, and then woken shortly before the spell expires.
(Base 4 change mental state, +2 Sun, +1 complexity of two mental states)
This spell is intended to allow a magus to get proper rest in difficult circumstances or an agitated mental state, but also awaken before their Parma Magica expires so it can be refreshed. It seems reasonable to have an extra magnitude to allow the degree of control.
It is a spell which I think would be popular in the Order of Hermes, particularly amongst the combative Magi.
Each troupe will have to decide if this is stretching hermetic complexity in design, given how complex some spells are I think this is a safe effect.