“你认为他是几点睡觉的？”用英语怎么说

what time do you think he went to bed?

When is he go to bed you think?

when do you think he goes to bed everyday?对平时睡觉习惯时间提问
when do you think he went to bed yesterday?对他过去时间内睡觉时间提问，这里假设为昨天

when do you think he goes to bed everyday?
或者
what time do you think he went to bed?

when do you think he went to bed ?

what time do you think he goes to bed ?