Informative Image: Graph of % of alarm presentations eliciting awakenings for all hearing levels based on sleep stage for all.

Long Description: 59% of the awakenings took place in the Delta sleep stage, 65% took place in REM, and 69% occurred in the more active Stage 2 sleep. There is a slight decrease in awakening effectiveness in the deepest sleep stage (Delta). Differences in awakening effectiveness cannot be statistically substantiated for this study.

• Slight decrease in awakening effectiveness in the deepest sleep stage (DELTA)

• Differences in awakening effectiveness across sleep stage can not be statistically substantiated for this study