As a work-at-home ghostwriter, following the advice that you shouldn't take your work home with you would have you out of business in short order.
  You will have to create a new set of rules that adapt to your work-from-home situation.
Establish Rules to Fit Your Work-At-Home Ghostwriting Career

• Establish set working hours.
  Not only will setting working hours help you get more work done, it will also give your mind permission to "stop work" at the end of the day.
  Even though the rebellious side of you may want to avoid all schedules, your mind will thrive on some type of schedule.
  This doesn't mean you can't establish flexible working hours.
  What you want to avoid is no schedule at all.
  For example, you may need to work evenings two or three days a week, and days the rest of the week.
  Your mind will adapt to the schedule.
  Set a time each day for ghostwriting, even if that time span isn't the same every day.
  
• Establish an office/work space.
  By establishing an area in your home that is consistently your ghostwriting work space, you will condition your mind to create a compartment in your mind that says "I'm working when I sit down at my desk.
  " When you get up from the desk and leave your ghostwriting space, the signal goes to your brain,  "I'm no longer working.
  
• Don't take your work to any other part of your home.
  Only write in your ghostwriting space so your mind associates "work" with your office space, not every other part of your home.
  If you need to read materials for a ghostwriting project, don't do the reading in your bedroom (even if your office is in your bedroom).
  Take the stack of books into the living room or pull up a comfortable chair in your office area.
  Don't spread the work out on your bed! Keep work connected to areas in your home you don't put up your feet and relax.
  Your mind won't relax when you want it to if the visuals around you are associated with working.
  
• Create an office environment through background music.
  Almost every business plays music.
  Take a hint and play music in the background.
  Just stay clear of music that has syncopation or words.
  That rules out most "easy listening" stations.
  Classical music has a very positive influence on the mind.
  It encourages the synapses in your brain to communicated more effectively, something every writer needs! Any music that is structured in a similar way has the same effect.
  

If you follow these guidelines, they will assist you with keeping your work life and the rest of your life sorted out.
You don't have to work seven days a week to be successful.
And you don't have to put in 18 hours days.
There's one major reason working from home should be better than a 9-5 job.
It should give you the freedom to have a non-work related life.
Working at home doesn't have to cause sleepless nights or interfere with your most treasured relationships.