I keep a little desk calendar, one I can set next to my computer as I write. It has all the deadlines marked on it, what dates I set for minor goals, and other important stuff like my daughter's school play or when I have to have certain bills paid.
Without it I'd literally be running on "Indian Time".
Another thing that is important is that you should have a daily schedule you try to stick to. Not every day will be the same as the next, there are unforeseen events and detours, but as a rule of thumb it helps to find a steady rhythm.
A better reason to keep a daily schedule is to force yourself to keep writing. Some days it is just hard to find the time, so you have to make the time.
As for me personally I tend to sacrifice my sleeping hours for relaxation and writing time. My daily schedule is pretty wild actually. Here's a typical break down.
5:30 am alarm goes off.
5:45 am second alarm goes off. I get up and take a shower.
6:00 am Get dressed, make a cup of tea. Check the news, weather, etc. Iron any shirts or clothes that need ironing.
6:15 am Get dressed.
6: 20 am Gather my school things (teaching supplies, materials, games, etc). Check emails on phone for any important messages I might need to read before leaving the house.
6:30 am Leave for work. The commute is just over an hour by car.
7:45 am Stop off at Seven Eleven for a bite to eat and a coffee booster. (I usually just eat a salad and maybe an onigiri -- Japanese rice-ball wrapped in dried seaweed.)
8:10 am Arrive at school.
8:45 am Classes begin.
Then work, work, work.
12:30 pm Lunch with my students.
Then work, work, work.
4:00 pm Finish work. (I get to leave early because, well, I have to drive all the way back into town). Drive home.
5:00 pm Pick up daughter from piano, ballet, swimming, abacus, etc.
5:15 pm Arrive home. Get dinner ready (unless wife has already done so). Get bath ready. Play with kids.
5:30 pm Eat dinner.
6:00 pm Wash dishes.
6:30 pm Give kids bath. (They're still young, so we take baths together -- it's our fun time!)
7:15 pm Get ready for bed. Brush teeth. Put on body lotion, take medicine, etc. Wife puts baby to bed.
7:30 pm Television time / or reading time (for Dad -- although daughter often helps watch).
8:30 pm Get daughter in bed.
9:00 pm Get yelled at by wife for letting daughter stay up and watch TV with Dad.
9:30 pm Read daughter a story. Finally get daughter to sleep. Watch more TV or read more.
10:00 pm Write some.
11:00 pm Decide whether to stop writing or keep going.
12:00 am Tell yourself you're going to bed but keep writing anyway.
1:00 am Finally, go to sleep.
3:00 am Wake up to pee. Go back to sleep.
5:30 am (Next Day) Wake up, rinse, and repeat.
So there you have it, my insane daily schedule. One which I've been on for about 4 years now.
People ask me how I get so much writing done with a family and all the books or shows I go through.
Some days I choose to go to be early, around 10 or 11 pm, but other times not. If I have a deadline, or a lot of editing to do, I will usually stay awake.
But if you want to write and remain productive, and not fall behind, then I strongly urge you to work out a schedule that works for you. With that said, good luck, and keep writing!