核心问题
go to bed 与 go to sleep 意思是否相同？
词典解答
go to bed 与 go to sleep 这两个短语的含义是完全不同的。前者表示“上床”“就寝”“去睡觉”，而后者表示“入睡”“睡着”“进入梦乡”。请分析下面的实例：
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He went to bed early that evening. 那天晚上他很早就上床睡觉了。
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I don't feel well, I'm going to bed. (CIE) 我觉得身体不舒服,我要去睡觉了。
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As I was reading I went to sleep. (JED) 我在看书的时候睡着了。
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She had gone to sleep in the morning and not wakened till the evening. (Bennet) 她早晨睡着了，直到晚上才睡醒。
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You can go to sleep without going to bed; and you can go to bed without sleeping. (Hill) 你可以不上床就睡着了；你也可以上床就寝，但却睡不着。