Sinking a Little

I do feel as if I'm sinking today. I've been low for the last few days and I've been waking up depressed. The tiredness is ten times worse than normal and I can fall asleep in seconds if I don't fight the urge.
I haven't felt like this for a while. The bouts of depression are normally a few days apart but this one certainly has a tight hold at the moment.
I should be active. There are things I could be doing, but the energy simply isn't there. I cannot motivate myself to do much at all. I did vacuum this morning which I'm pleased about and I was going to do the washing-up from last night but we've run out of washing-up liquid.
I normally visit friends on a Saturday but I simply cannot today. I will go shopping with my wife instead and hopefully this will prevent me sinking any deeper. I really don't want the dark thoughts to come back.
My Moodscope rating is 8%.