I used to meditate all the time in bed. That was when I was raising my daughter, and I'd get her up and off to school, and then I would go back to bed and meditate. And then I would do the same in the evening, and that was very good for that period because I had so many things to juggle as a single mother.
Nothing in this world can take the place of persistence. Talent will not: nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not: the world is full of educated derelicts. Persistence and determination alone are omnipotent.