Total wake time (TWT) can be calculated as the difference between total recording time and total sleep time.

Total wake time (TWT) can be calculated as the difference between total recording time and total sleep time.

• A. 85 minutes
• B. 25 minutes
• C. 100 minutes
• D. 75 minutes

Answer: (A)

The main idea is that total wake time shows how much of the recording period the person was awake. It’s found by taking the total recording time and subtracting the total time spent asleep: TWT = total recording time − total sleep time. This difference accounts for all wakefulness during the study, including any awakenings before sleep onset or during the night that fall within the recording window. For example, if the recording time is 210 minutes and the total sleep time is 125 minutes, the total wake time would be 85 minutes, which matches the given correct value. The other numbers would come from different pairs of recording and sleep times.

The main idea is that total wake time shows how much of the recording period the person was awake. It’s found by taking the total recording time and subtracting the total time spent asleep: TWT = total recording time − total sleep time. This difference accounts for all wakefulness during the study, including any awakenings before sleep onset or during the night that fall within the recording window.

For example, if the recording time is 210 minutes and the total sleep time is 125 minutes, the total wake time would be 85 minutes, which matches the given correct value. The other numbers would come from different pairs of recording and sleep times.