Boring or Relaxing?

Norah falls asleep every time we go to church.  I don't know what it is, and it doesn't seem to matter what time it is.  9am?  Sleeping by the homily.  11am? Dozing by the Gloria.  Anything later than that and I swear she's sleeping before he's finished welcoming us to mass.  I don't know what it is, and I will say that during mass I'm thrilled she's super lightweight for a four year old.  I don't have any issues holding her with all the standing and sitting.  In fact she usually only wakes up right before the Eucharist because I have a much harder time holding her and kneeling.  So now I'm left wondering... is she ultra bored, or super relaxed?