One thing to keep in mind, is that nocturnal sect increases permanently your healing potency by 5%. Not much to look at but still..
Which means that total potency of your aspected helios is 147 shield and 147 heal(3 potency behind SCH)
And aspected benefict comes up at total of 525, which is 75 behind SCH and can't crit, but is instant cast and costs something between benefic I and benefic II.

It's still rather worthless in general and when you later on compare time dilation advantages on diurnal... then pretty much only time you should be using nocturnal is when you are with another AST.
But nocturnal asp. benefict does have a meaning - instant heal and shield, saves lives sometimes.