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. Author manuscript; available in PMC: 2022 Jan 15.
Published in final edited form as: Neuroscience. 1999;91(1):391–400. doi: 10.1016/s0306-4522(98)00588-0

Table 2.

Sleep state durations in minutes and percentage sleep time, based on a continuous 48-h period of electroencephalogram, electro-oculogram and electromyogram telemetry recording, scored in 1-min epochs

State Hours/day Sleep time (%) Episode duration Episode range
Wake 9.7 — 25.4 ± 73.4 0.3–390
QS-M 6.7 47.0 5.5 ± 7.8 0.3–42.7
QS-H 1.7 12.2 7.2 ± 7.7 4.6–31
REM-M 5.2 36.8 5.3 ± 6.3 1.7–32.8
REM-H 0.6 4.0 3.1 ± 2.7 1.0–10.8

The criterion for REM-M and REM-H was more than three phasic events exceeding the mean phasic event amplitude per epoch. Using these criteria instead of the one phasic event criterion used in Table 1 caused a large drop in the mean duration of REM periods, but a relatively small change in total REM time.