The local police were handing out road safety tips the other day. I don’t remember all the wording, but it mentioned something about somnolencia. I knew, of course, that insomnia (in English) is the inability to sleep, so I figured that somnolencia was drowsiness, or sleepiness. From my study it seems that somnolencia is the medical term for sleepiness. Normally we hear people say “tengo sueño” to mean “I am sleepy.”