English for Today by Ganiu Abisoye Bamgbose (GAB)
How not to use article “the”
What are you doing here at this time of the night (nonstandard)?
What have you been doing here at this time of night (standard)?
You have to take whatever she says with a pinch of the salt (nonstandard).
You have to take whatever she says with a pinch of salt (standard).
I’m on the bed (nonstandard).
I’m on bed (standard).
GAB

Which is correct sir “I am in bed or I am on bed”