How do you manage this without falling asleep? Whenever I've tried meditating before, I've just ended up falling asleep. :) This is my main problem with relaxation in general -- relaxing tends to make me feel sleepy, and sleep (in mid-day) tends to make me more tired, and less focused than I'd be otherwise.

Stuart Wilde said that was the whole point. Most people associate a relaxed state with sleep and the only time they ever get into alpha is on their way to delta and unconsciousness. Mystical trance is achieved when you remain awake, but the mind enters the alpha state.

Forcing yourself to sit up can help.