For us, it is a balance between what the kids want and what we as parents want. I do lots of background things (like looking up our state's curriculum guides online), but then let dd choose what she wants to learn about. I then try to work in things that apply to what a typical kid her age would be learning. Sometimes she chooses to work out of workbooks, but I don't make her do it.
I let her chose mostly what she wants to eat, but that is really more about her problems with eating than it is our unschooling philosophy. We do have a rule that you have to balance healthy foods and treat foods, but that's it.
Bedtimes are fairly consistent. I need down time at night. So dd goes in her room about 8:30, she often is still up at 10, but she stays in her room on her bed reading and listening to music. Ds is just a toddler, but I put him down around 8ish. Dh works late so I have a couple hours alone every night, which I really need.