Figure 7.

Percentage change in inspiratory time during NREM and REM sleep. The percentage change in inspiratory time (T_I) during nonrapid eye movement (NREM) and rapid eye movement (REM) sleep is shown for the 3groups. See Figure 1 for a description of the box plots. During NREM sleep, study participants with obstructive sleep apnea syndrome (OSAS) had a lower percentage change in T_I in response to CO₂ than those in the control groups. During REM sleep, study participants with OSAS had a lower percent change in T_I than those in the obese control group.