The crossword solution for the term 'SLEEP MOMENT' is 'WINK, ' which is a four-letter word. A WINK is a facial expression made by briefly closing one eye. It is used to convey a range of emotions, including humor, affection, and understanding. Winking can also be used as a form of nonverbal communication between two people, often to indicate a shared secret or joke. In this context, a 'sleep moment' could refer to a brief period of rest or relaxation, such as taking a nap or dozing off for a few minutes.