Помогите составить 5 вопросов по предложению: I was sleeping at the table.

Where were you sleeping
Why were you sleeping at the table
What were you doing at the table
Were you sleeping at the table
Who was sleeping at the table

1. Why were you sleeping at the table
2. When were you sleeping at the table
3. How long time , have you been sleeping at the table
4. At what time , you were sleeping at the table
Пятый пока думаю, а так надеюсь , что правильно