Most dreaming happens towards the end of our
sleep period, and with a high level of
sleep deprivation, what little
sleep you get could be deeper levels, as indicated by the time you spent in N2 and N3 sleep. You need to find an expert who can interpret your results. Sadly, some (most?) sleep "experts" are not sleep experts, they are sleep apnea experts who can do little more than diagnose sleep apnea and prescribe cpap machines. That was the results of my sleep study.