在英语中，小学生睡觉可以用下列几种表达方式来表示：

"a primary school student sleeps"：一位小学生睡觉
"a primary school student is sleeping"：一位小学生正在睡觉
"a primary school student has gone to sleep"：一位小学生已经睡着了

这些表达方式来自英语中最基本的动词，即 "sleep" 和 "go to sleep"。

下面是一些例句，包含了这些表达方式：

"The primary school student falls asleep easily every night."（这位小学生每晚都很容易入睡。）
"The primary school student is having a good sleep in his bed."（这位小学生正在床上睡得很好。）
"The primary school student went to sleep early tonight."（今晚这位小学生很早就睡着了。）