How do you cope with your creative work becoming prohibitively tedious?

I used to love painting, drawing, and playing guitar. But when I'm doing them now I find myself feeling tired and extremely bored. The things that I find enjoyable have become tedious for me.<br><br>I've also been feeling tired on the weekends, but I haven't been getting enough sleep so I'll focus on that first.<br><br>How do you cope with your creative work being tedious?