Insomnolence means the inability to sleep or excessive sleeplessness. The antonyms for insomnolence would be words that refer to the opposite of this condition, such as somnolence, drowsiness, lethargy, slumber, and restfulness. These words suggest feelings of calmness, relaxation, and peace, indicating that the individual is able to sleep peacefully and restfully. Somnolence is a state of drowsiness or sleepiness, which is the opposite of restlessness. Drowsiness refers to a feeling of low energy and a desire to sleep, whereas lethargy suggests sluggishness of the body and mind. Slumber implies a restful and calm state of sleep, while restfulness relates to a sense of relaxation and peace.