When it comes to describing the simple act of going to sleep, there are a variety of synonyms that can be used in place of "went to bed." These include phrases like "hit the hay," "turned in," "retired for the night," "called it a day," and "hit the sack." Each of these alternatives offers a slightly different connotation, depending on the context and tone of the sentence. For example, "hit the hay" might suggest a more playful or whimsical tone, while "retired for the night" could imply a more formal or subdued atmosphere. Ultimately, the choice of synonym will depend on the writer's individual style and the desired effect of the sentence.