Take a break -- not from schooling, but from the regular routine of it -- plan a fun day! Take a day where you simply play educational games for the day or mix it up with some educational games and great pretend.
Here are some examples: Preschool age children can play games like CandyLand to work on their colors, Chutes and Ladders or Hi-Ho Cherry-O! to work on counting, then break out the toy musical instruments, or better yet, make some (ideas and directions below) and have them march around the house playing the instruments, and, finally, read them a good book from history like Hornbooks and Inkwells by Verla Kay. You've just completed a day of school, your child learning their colors, counting, playing music, physical education (marching around the house) and history, and you all had fun!
Elementary age children can play games like Parcheesi, Sorry or Yahtzee to work on counting/adding or for more of a challenge, have them roll two dice and then practice adding, subtracting, multiplying and/or dividing the two numbers that are rolled, and that's Math. Play Scrabble, Boggle, Taboo or Scattegories to work on spelling and language skills, and that's English. Read a Magic Schoolbus Book for Science and then read something like Little House on the Prairie by Laura Ingalls Wilder or Children of the Covered Wagons by Mary Jane Carr, then you can pile things onto a single bed or the sofa and pretend that's your covered wagon and you can pretend with your children that you are traveling west in a wagon train. You can pretend to face a pack of wolves, see a rattlesnake, meet Indians, just about anything your child or you can remember from the story or imagine.
Nothing like a little fun to get you motivated again. It works for us every time. Other ideas are to simply have an art day where you just do different art projects for a day and do some messy stuff that you wouldn't schedule into a day when you're trying to cover all of your subjects. Or have a science day and do lots of fun and messy science experiments. Just change the routine and make it fun!
Ideas and instructions for making some musical instruments:
Take an empty Quaker Oatmeal container and glue some construction paper, or for a longer lasting drum, card stock to cover the open end and your child can hit it with a spoon.