Do you sit up or lie down to meditate?

Mostly I meditate sitting up because I feel a little sleepy while laying down but if you want to lie down and meditate then you can do shavasana where you lie on a yoga mat while resting your entire body this is a form of yoga

I lie down for meditation. When I first attempted meditation some months ago I used to sit up. The problem was my upper and lower back become tense and begin to hurt. It made mediation into something that resulted in pain rather than relaxation or thought. It took away for the from the experience. So when I found out I could lay down for meditation sessions I started doing it more often.