I'm trying to juggle composing for games, going to school full-time, recording with my band, and working late nights as a stagehand with a local production company. I keep notes on my desktop with things I still need to write for games, and I keep track of work days/nights when I'm scheduling recording, and I honestly often skip my morning classes because I'm too tired from work. Then my day goes catching the afternoon classes, maybe working on one track for a game, maybe eating like two pieces of pizza and taking a power nap, drinking some coffee before heading to work. etc. etc. Obviously I'm not a productivity guru right now but I just take it one day at a time and as long as I have the passion for all this work, I'll get through at least most of it. Still learning, though.
Also, seriously pencil in personal time. If you have a girlfriend/wife/partner/whatever, make that time happen. If you're with the right person, aside from the obvious perks of being in a loving and committed relationship, you are a team with a goal in mind for the future and having that person will likely make you more productive in the long run. I know my girlfriend takes up much of my personal/creative time, but strangely enough I've found it's made me value my time more, and you'd be surprised what a little change like that does for you. Makes you only take on jobs/projects that matter.