No, it's on a very strict schedule. First sleep has to start 2-3 hrs after you wake up & then every 2 hours they lie you down & calibrate the sensors, and then you have to keep your eyes open until the exact minute when the test starts and then they switch off the light & out they go. And then ??? mins later they reappear & haul your sorry ass out of bed juuuuust when you're getting all comfy & snoozy. LOL.
FWIW Arte, dream recall is not always a reliable indicator of whether you are dreaming or not. All the sleep techs think its hilarious because people will say they haven't slept at all when they've slept heaps AND dreamed, other people say they have dreamed who didn't even fall asleep, and one person even fell asleep while they were talking & had rem sleep & woke up again in the middle of saying they hadn't slept at all. LOL. Mind you for the purposes of this exercise a single sleep spindle counts as sleep, so if that's 3 seconds of stage 1, that's still "sleep" for the purposes of the test. So rest assured, you probably do dream, but you just don't wake up during REM.
ETA - if you're still in mummy sleep deprivation land, you probably have REM-rebound where you do MORE dreaming than normal, often earlier in the sleep period. It's like your brain is making up for it. Sometimes this means people remember more dreams but sometimes it means they remember fewer dreams. It's all about when/how you wake up.
