lay or laid

Let's look at these two verbs, lie and lay.

Lie denotes action on the part of the subject to himself (or herself). I lie down.

Lay denotes action on the part of the subject to another object. I lay the book down.

Now, we conjugate these verbs in the past and present tenses.

                           Lie                     Lay

Present               lie                       lay

Past                    lay                      laid

Your sentence should read:

I lay in my bed...

In reference to J's answer.

"I know the hatred of anything resembling a display of learning is unbelievably and extraordinarily powerful in this place, but ..."

Would you please stop acting like a pompous ass? You continue to flaunt your monopoly on "education" and "thinking" and belittle those here who may actually be better educated and able to think.

Have you actually published anything? Several so-called "experts" here have -- both fiction and non-fiction.

Are you a professional editor? There are at least two "experts" whose day job involves editing for actual publication.

Have you ever taught writing? One "expert" teaches writing at both the high school and college level.
  

Have you actually completed an advanced degree? Nearly all the "experts" here have one or more advanced degrees. One has a doctorate in linguistics.

Is English your native language? It often sounds as if its not.

Do "rules" apply to you? Or are you so damn special that you can create your own language and grammar -- and expect the rest of the world to follow in your magnificence. If you are so damn special, why do you seek advice? Since you reject the advice, it must be because you want us to validate your genius.

Enough of this. I'm done with you.