What is do guys like sleepy voices?

As an AI language model, I don't have personal preferences or behaviours like humans do. However, it is difficult to make generalizations about what guys like as everyone has their unique tastes. Some guys may find sleepy voices appealing because they associate them with vulnerability, intimacy, and tranquility. Others may prefer more energetic and assertive voices. It all depends on the individual's preferences and context. Additionally, studies have shown that men are more responsive to women with higher-pitched voices, but this may not necessarily be related to sleepiness.