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.
At one point I learned transcendental meditation. This was 30-something years ago. It took me back to the way that I naturally was as a child growing up way in the country, rarely seeing people. I was in that state of oneness with creation and it was as if I didn't exist except as a part of everything.