After reading this: in/on the bed, I wonder whether "I'm on bed" is ungrammatical or not. The answerer of the question said

"On" never appears alone with "bed."

If we can say "I'm in bed", why can't we say "I'm on bed"? (Or can we?) I'm not sure, because I'm also familiar with on+noun. For example "on Y*uTube".


1 Answer 1


“In bed” is an idiom that refers to a person who is resting or sleeping in a bed. It frequently implies being under bed clothes. Like other idioms, it can be odd.

“On the bed” is not an idiom and so follows the normal rules of English with respect to articles.

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