Know that having poor posture is not going to help you in the long run. It can potentially put strain on your neck as well as the tissues of your lower back. It can also leave you feeling tight and stiff. Try improving your posture through changing your workspace. For example, if you're sitting up in bed, head down and slouched, that puts a lot of tension on your neck tissues and the tissues of your low back. If you have a higher dresser in your house, I recommend using it as a standing desk and standing for maybe 45 minutes to an hour a few times a day instead.