You cannot see your alertness graph without logging sleep data

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From: Steven Zhong
Country: China,
Sent: Jun 10, 2011, 10:10:01
Subject: Alertness graphs show nothing

Question

In my SuperMemo, Alertness graphs in SleepChart show nothing or show error messages.

Answer

To see how your alertness changes in the course of the day, you need to first log in your sleep data. Moreover, you need to make repetitions on the days you log your sleep. If you have no sleep data, or sleep blocks are not interspersed with repetition blocks, you will not be able to see your alertness graphs in SuperMemo.