几点睡觉 should be accepted,
What about the subject?
You what time sleep? Is that the basic word order?
What about "Ji dian ni shui jiao?"
你几点去睡觉了, is used by my Chinese friends
That sounds like a past tense question? "What time did you go to sleep?" I'm not telling, just asking.
几点你睡觉？Why is this wrong?
Why is 你睡觉什么时候 wrong?
English speakers usually say what time do you go to sleep. or even go to bed if the answer is a specific time like 11:00.