From time to time

You do something “from time to time” if you do it only sometimes, and not on a regular pattern. You might get a haircut “every two weeks” (on a regular pattern), but you might only get a massage “from time to time.” That means, you get a massage sometimes, but not on a regular, predictable schedule like your haircuts.

You can start a sentence with “From time to time” as well. You can say: “From time to time, I like to take a day off from work just to relax.”