Total sleep time was reported as how many minutes?

Total sleep time was reported as how many minutes?

• A. 180
• B. 240
• C. 200
• D. 220

Answer: (B)

Total sleep time is the actual amount of time spent asleep during the recording. You determine it by adding up all sleep periods (N1, N2, N3, REM) from the moment sleep begins to the final awakening, and you do not count the times the person was awake. In practice, you can also compute it as time in bed minus wake after sleep onset. If the data show four hours of sleep across the recording, that equals 240 minutes of total sleep time. The other minute values would correspond to shorter amounts of sleep, which would occur if there were more wake periods or a shorter time in bed.

Total sleep time is the actual amount of time spent asleep during the recording. You determine it by adding up all sleep periods (N1, N2, N3, REM) from the moment sleep begins to the final awakening, and you do not count the times the person was awake. In practice, you can also compute it as time in bed minus wake after sleep onset. If the data show four hours of sleep across the recording, that equals 240 minutes of total sleep time. The other minute values would correspond to shorter amounts of sleep, which would occur if there were more wake periods or a shorter time in bed.