Each and every Artist has to self-start on a daily, hourly basis.    When working in solitude its up to you to start early and stay at your drawing board/desk/easel and stay there until what you set out to do is complete. 

My advice is to work regular hours.  It doesn't matter when these are but try to repeat the pattern that works best for you.  As an example, I have two small children and my day worked best as follows...up, children, bonkersness until school and nursery - drop off at breakfast club so I can be back at my drawing board for a 9am start.  Work until collection from nursery (about midday) - lunch with babe then she slept.  As she slept for an hour so did I!  This recharged my creative batteries for an evening shift.  Afternoon off, school collection, tea, bath, bed then back to drawing board at 7.30 to work until 10.30.    This worked for me and I continued this pattern for about a year. 

My example above shows that one can work around children BUT not to the extent that you get yourself exhausted..there is absolutely no point in this as everyone suffers.  Take what you will in terms of hours - perhaps you might only be able to carve out 2 clear hours aday - try to keep these regular and you will be amazed at what you can achieve during them.   Keep going....