Sleepy or drowsy; inclined to sleep.
From Latin 'somnolentus,' from 'somnus' (sleep). Related to 'insomnia' and 'somnambulism' (sleepwalking). The root 'somn-' appears throughout sleep-related vocabulary in English.
Connect it to 'insomnia' — both share the 'somn' (sleep) root! While insomniacs can't sleep, somnolent people are perpetually sleepy. It's like being in a permanent state of 'I could totally take a nap right now.'
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