Histogram

Sleep stage of fifth 30 second epoch in 5 minute window vs Visit Number
Baseline Follow-up
Total 44,621 39,667
Wake 3,974 2,949
Stage 1 3,439 2,777
Stage 2 16,802 16,049
Stage 3/4 12,757 11,134
Stage 3/4 - 44
REM stage 7,649 6,714