It doesn't make sense to some writer's to use time management on a daily basis. Then when Lady Luck smiles upon them and they have a looming deadline time management become very important. However, because it's not practiced daily they may have trouble adjusting to the new schedule.
It's been said that if you do a certain thing for twenty one days straight then it becomes a part of your normal routine. This is a theory to keep in mind with time management in your writing. Set a goal to write a certain amount of words a day or set aside a couple of hours during your peak time (if you can) and try out that theory. Not only will this become a routine activity in YOUR day, it will also become a routine event to family members and hopefully they will respect your time in front of the computer!
Try out this theory and let me know if after twenty one days, you're in a writing routine!