I left my appliance at a friend’s house on Monday. So, Monday night I slept with no appliance. I woke up about 5 a.m. with a sore throat, stopped up nose and a headache—and tired. I felt pretty awful most of the morning until I got those things under control. I got my appliance back in time to wear last night. I slept solid from 11:57 p.m. to 5:58 a.m. (according to my Fitbit); then was a little restless and then slept another hour. This morning I feel great—no sore throat, no stopped up nose, no headache and feeling rested!