Why don't i sleep at night?

When i think to myself, why don't i sleep at night. I seriously don't have a clue.

I can't shut my brain off, i can't lay down and rest, i just can't sleep.

When i can't, i think, nah, it's too late to try and sleep, so why try.

This is stupid, because i am always so tired in the morning, sad and sick off life.

Sometimes i end up sleeping the day away, and missing out on the whole day, because my brain has decided to stay awake, and ruin me. By sending pain my way. Yay! Thanks brain!