The chiro 'bone cracking' in places other than C-1 and maybe C-2 can be amazingly beneficial. But, C-1 and C-2 need a gentler approach for many. The issue is not as much posture while awake and looking at the computer as it is that posture when the muscles are relaxed, sleeping or resting. We can put a lot of strain on the C-0 (occiput) to C-1( Atlas) and C-1 to C-2 when sleeping. Those joints do not have the self lubricating function the lower joints have so when they get out of place, they can tend to stay that way. Then, the ligaments get stretched and the surrounding tissue inflamed.

Many feel uncomfortable with their head laying flat. Maybe there is a vestibular memory. It is a learned behavior to be able to rest or sleep with minimal pillow lift when on your back. It can be learned because many have. I use no pillow lift at all. I bunch up my pillow to the side so my right cheek rests against it. A challenge is falling asleep without tossing to change position/posture. I wonder if sleeping with a cervical collar would help.