A sudden temperature change on ESta's face will be sufficient to wake him up, especially given that he had previously had some enforced rest and was trying deliberately to doze.  Among the many ways that divine casters are superior to arcane casters is that they can cultivate a normal adventurer's virtue of waking up for small anomalies, rather than trying to stay asleep at nearly all costs.

A sudden temperature change on Esta's face will be sufficient to wake him up, especially given that he had previously had some enforced rest and was trying deliberately to doze.  Among the many ways that divine casters are superior to arcane casters is that they can cultivate a normal adventurer's virtue of waking up for small anomalies, rather than trying to stay asleep at nearly all costs.