How do you calculate Total Sleep Time (TST)?

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Multiple Choice

How do you calculate Total Sleep Time (TST)?

Explanation:
Total Sleep Time is the total duration spent asleep during the recording, so you add together every sleep stage that occurred. REM sleep is part of sleep, not wakefulness, and it should be included in full when calculating TST. Therefore, you sum N1, N2, N3, and REM. This gives N1 + N2 + N3 + R. The option that halves REM undercounts sleep, while the option that uses lights-on to lights-off reflects Time in Bed rather than Total Sleep Time, and the option that undercounts REM (R/4) also fails to capture all sleep.

Total Sleep Time is the total duration spent asleep during the recording, so you add together every sleep stage that occurred. REM sleep is part of sleep, not wakefulness, and it should be included in full when calculating TST. Therefore, you sum N1, N2, N3, and REM. This gives N1 + N2 + N3 + R. The option that halves REM undercounts sleep, while the option that uses lights-on to lights-off reflects Time in Bed rather than Total Sleep Time, and the option that undercounts REM (R/4) also fails to capture all sleep.

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