The word "predormitium" refers to the state just before falling asleep. It is pronounced /priː.dɔːrˈmɪ.ti.əm/ with stress on the second syllable. The first syllable is pronounced as "pree" with a long "ee" sound, and the second syllable is pronounced as "dor" with the "o" sound as in "or". The third syllable "mi" is pronounced with a short "i" sound, and the fourth syllable "ti" is pronounced with a short "i" sound and a schwa sound at the end.
The stage of semi-unconsciousness preceding actual slumber.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.