Wakeful is a term used to describe someone who is alert and attentive, often staying AWAKE for long periods of time. The crossword solutions for this term include RESTLESS (8 letters), WAKING (6 letters), INSOMNIAC (9 letters), HEEDFUL (7 letters), AWAKE (5 letters), and SLEEPLESS (9 letters). All of these words are related to being AWAKE and alert, with RESTLESS and SLEEPLESS referring to the inability to sleep, WAKING and AWAKE referring to the state of being AWAKE, and INSOMNIAC and HEEDFUL referring to someone who is AWAKE and attentive.