Most artists find themselves in a situation where they need to supplement their income...bread-and-butter money, i call it. Sometimes it can be related work, such as teaching their art, but often it's more likely to be in another arena, which can be the polar opposite to their work as an artist.
It's not easy jumping from one thing to another. After a day working in the office, it can be frustrating to find the right headspace to work on one's masterpiece. Even working from home can be fraught with a myriad of challenges, and many artists find that inspiration is elusive when you have the stresses of work hanging over you.
There are some ways around this. Getting into a groove or a routine can be helpful at times. Even if you don't feel the muse, just spending time in your creative work area can ease you back into the right frame of mind. Simply tidying up your workspace, or doing something else mundane in your studio can help get you back there. Sometimes, NOT having any goals can ease the expectations of achieving something, which can get you into a much more relaxed state, where you're more likely to find some kind of flow again. There's no need to put yourself under any more pressure than is necessary, and the small and seemingly insignificant things can actually turn out to be just what you needed.
Of course, sometimes a dose of serious pressure can be highly motivational. Deadlines can sometimes be the inspirational force necessary to birthing a new piece, and halting a state of procrastination. If it works for you, try and set your own personal deadlines, but be aware that too much unnecessary pressure can also be counter-productive.
The good thing about having a regular income is that it can save the stress of needing to sell something or deliver the artistic goods to keep food on the table and a roof over your head. If there's a way to earn money that is related to your artform, it's fantastic, but even if it's something completely different, it can give you the freedom to be free from financial worry. You're not necessarily "selling out" by taking that job (which is something i hear often from artists). It can be a great gift to have the freedom to work on your art without wondering if it's going to feed you next week.
Of course, everyone is different, and whatever your situation, there is always a way you can make it work for you. Keep it simple, and take it easy on yourself. If it doesn't work for you today, there's always another day tomorrow.