+1, in the past where I worked in hospitality, 4 days on 4 off, I could happily spent 3/4 days off building websites.

For the last 2 or 3 years working in agencies, you need a lot of extra willpower to get back on the computer after work.

I work best late at night and early in the morning so just try and fit my side projects in around that time, when I'm most productive.