Ύπνος is the noun [o ύπνος (masculine) = the sleep] and κοιμάμαι is the verb [(first person) = I sleep / I am sleeping].
For example:
- Ο ύπνος είναι σημαντικός για την υγεία μας ( = Sleep is important for our health)
- Δεν κοιμάμαι πολύ καλά τελευταία ( = I don't sleep very well lately)
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.