Insomnolent is an adjective that describes someone or something that is unable to sleep. There are several synonyms for this word, including sleepless, wakeful, restless, and unable to sleep. Other synonyms include insomniac, insomnious, insomnolence, and insomniatic. These synonyms all describe a state of being where the person or thing is unable to fall asleep or stay asleep. Insomnolent may be caused by a number of factors, including stress, anxiety, depression, and medical conditions. Regardless of the cause, finding synonyms for this word can help people understand what it means and how it affects those who experience it.