It's really difficult to not get distracted when you work from home because there are a million things you could be doing verses the one thing you should actually be doing. If you woke up this morning with only a smidge of interest in working on your novel or writing project, trust me, it will be very easy to achieve little or nothing today.
So how can you stay motivated?
First of all, set yourself a realistic target for the day. Something along the lines of editing 100 pages, writing the first draft of a chapter, or piecing together a sub plot using a spider diagram. Try not to beat yourself up if it doesn't happen for you, but do everything you can to complete the task by the end of the day. That in itself will give you a massive boost.
Allow yourself some day dream time (maybe when you're making and eating breakfast - or lunch - or both) and let the buoyancy of the day dream carry you for a moment or two. It's ok to get swept up in best case scenarios (I do it all the time!) but don't turn the dreams into your expectations. You'll only be setting yourself up for a mighty fall...
Finally, write what you love and love what you write - and do all that unconditionally. Trends and markets are important (and they should always be sitting in the back of your mind) BUT if it's coming out stilted, you'll know straight away and it'll put you right off. DON'T think too much about the technicalities. DO focus on the heart of the story. Tuning and fine tuning come much later. That's what second, third, fourth and fifth drafts are for!