Histogram

Sleep stage of fifth 30 second epoch in 5 minute window vs Visit Number
Baseline Follow-up
Total 44,622 39,773
Wake 3,974 2,951
Stage 1 3,439 2,779
Stage 2 16,803 16,095
Stage 3/4 12,757 11,168
Stage 3/4 - 44
REM stage 7,649 6,736