Histogram

Sleep stage of tenth 30 second epoch in 5 minute window vs Visit Number
Baseline Follow-up
Total 44,622 39,773
Wake 4,034 2,936
Stage 1 3,236 2,705
Stage 2 16,859 16,158
Stage 3/4 12,811 11,180
Stage 3/4 - 41
REM stage 7,682 6,753