Suge Knight -- My Toilet Is Possessed ... Oh Yeah, I May Have a Brain Tumor

9 AM PT -- Suge's request to move to a new facility was denied during a hearing in L.A. Ditto for his attempt to reduce bail.

Suge Knight's life in prison is rough ... not only does he have to deal with a toilet that flushes incessantly ... he might -- MIGHT -- have a brain tumor.

Knight's new attorney, Tom Mesereau of Michael Jackson fame, filed new docs to get Knight into better digs at the jail, for both medical and sanity reasons.

Suge's lawyer claims Suge is going crazy because the toilet in his cell flushes every 20 minutes -- on its own -- all day and all night.

To make matters even worse, the jail bed isn't long enough to hold his 6'2" frame.

So Suge wants a new cell that doesn't drive him crazy and allows him to get a good night's sleep.

Even more serious -- Mesereau says Suge suffers from numbness on one entire side of his body and doctors have told him he might have a brain tumor. As such, he wants a place that has full access to a competent medical facility.

He's currently locked up on $10 million bail.