Insomnia (again !)

Yes the insomnia has returned and so I'm not getting to sleep until 7am, which is slightly annoying. But it does mean that I sleep through a huge amount of noise. Which is what happened yesterday, when I managed to sleep through the noise of someone ripping out the shower base using hammers and generally making a huge amount of noise, but I for once was totally oblivious to the whole thing.
And now I am trying to decide if I want to go to sleep or stay awake for as long as I can manage. Which for some reason seems like a really difficult decision, but I guess I will just wait and see how I feel.

Why can't I sleep?

Apparently after about a week of "normal" sleep, my body has returned to the default of staying awake all night and randomly sleeping throughout the day. I just don't understand why this has happened, unless it is to do with the fact that I am slightly stressed out over my course.
And it really doesn't help that for the last few days I have been feeling really down and I just hope that it doesn't turn into full blown depression as I don't think I could cope with that at the moment.
Apart from not sleeping nothing of note has really happened within my life, and I know that I should be doing things and getting out but I just don't really see the point at the moment. I think that I have lost all motivation to do anything and I really don't like feeling like this, especially since the days are drawing in and more often than not it rains all day, which really isn't encouraging when you are thinking about going out.
Oh well, I suppose that tomorrow is another day and maybe I will feel better and happier than I do right now.