Histogram

Sleep stage of second 30 second epoch in 5 minute window vs Visit Number
Baseline Follow-up
Total 44,622 39,773
Wake 4,027 2,952
Stage 1 3,604 2,914
Stage 2 16,657 16,059
Stage 3/4 12,765 11,145
Stage 3/4 - 47
REM stage 7,569 6,656