on/in (the/a) bed

[Sitifan]

1. He is sleeping in bed.
2. He is sleeping in a bed.
3. He is sleeping in the bed.
4. He is sleeping on bed.
5. He is sleeping on a bed.
6. He is sleeping on the bed.
Which of the above sentences is NOT acceptable?
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Thank you very much for your reply.

[Ralf]

#4 is ungrammatical

#4-6 are unusual. You could use them if 'he' is a dog.
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