"Going to bed" is a commonly used phrase, but there are a variety of synonymous phrases that can be used to convey the same meaning. For example, "retiring for the evening" or "heading off to sleep" are slightly more formal options that can be used in more professional settings. "Hitting the hay" or "tucking in for the night" are more casual expressions often used in everyday conversations. "Climbing into bed" or "curling up under the covers" paint a vivid picture of the action being taken. No matter which synonym is used, they all mean the same thing: it's time to call it a night and get some rest.