A check
You had a bad night and you are exhausted. On this lesson, what does the fixed wake time ask of you tomorrow morning?
Sleep in, because you clearly need itGet up at the usual time, and get some daylightStay in bed but do not sleepCut your time in bed to match how long you slept
Yes
Getting up at the usual time is the whole point, because a wake time that moves after a bad night takes the body clock with it and spends the sleep pressure you needed for the evening. Staying in bed awake teaches the bed the wrong lesson. And cutting your time in bed to match your sleep is sleep restriction, which is not taught here and needs a clinician to screen you first.