I did a buried double sleep, but
on the 1st and 2nd days, I slept mostly sitting up,
but when I slept sitting up, my neck and back hurt so much, so on the 3rd day, I only slept with the pillow raised, and today is the 4th day, and I just slept with the pillow.
How long do I have to sleep with the pillow raised?
And do I have to sleep sitting down or can I just raise the pillow??