Histogram

Sleep stage of tenth 30 second epoch in 5 minute window vs Visit Number
Baseline Follow-up
Total 44,621 39,667
Wake 4,034 2,935
Stage 1 3,236 2,701
Stage 2 16,858 16,108
Stage 3/4 12,811 11,151
Stage 3/4 - 41
REM stage 7,682 6,731