Histogram

Sleep stage of second 30 second epoch in 5 minute window vs Visit Number
Baseline Follow-up
Total 44,621 39,667
Wake 4,027 2,950
Stage 1 3,603 2,909
Stage 2 16,657 16,016
Stage 3/4 12,765 11,112
Stage 3/4 - 47
REM stage 7,569 6,633