Insomnia?

What is insomnia, really?

If you would be perfectly capable of falling asleep rapidly if you were to lie down and attempt to sleep, and know you should do so, and are in fact feeling somewhat tired, but are unwilling/somehow psychologically unable to actually go to sleep, is that insomnia, or something else?

Speaking of Insomnia

Spent a number of hours after I went to bed either in very short sleep cycles I couldn't remember punctuated with periods of being awake with thoughts running through my head, or completely unable to sleep; not sure which. That was followed by the rest of the night in slightly longer sleep cycles punctuated by waking.

Naturally, had difficulty getting out of bed in the morning, continuing the pattern of inefficient sleep/wake.

Between that and the dark and rain, I'm going to be exhausted all day.

My arms are also killing me, as they were before I went to bed.