How to spell SOMONAHNCE correctly?

If you meant to type "somonahnce" but realized it must be incorrect, there are a few potential correct suggestions. "Somnolence" refers to drowsiness or sleepiness. Alternatively, "substance" could be appropriate if it was a typo or "sequence" if you were referring to a specific order of events. Double-check and choose the word that fits your intended meaning.