Histogram

Sleep stage of third 30 second epoch in 5 minute window vs Visit Number
Baseline Follow-up
Total 44,622 39,773
Wake 3,997 2,975
Stage 1 3,565 2,870
Stage 2 16,718 16,056
Stage 3/4 12,737 11,155
Stage 3/4 - 40
REM stage 7,605 6,677