Ensure you have LibSparkAppList installed from the SparkDev repo:* https://sparkdev.me/
Tapping the button sends your phone back to portrait orientation, where you can then freely auto-rotate the phone relative to your face while lying down!
The tweak is highly configurable, with features such as "rollover", enabling you to correct the orientation if you change direction in bed!
Lastly, to restore normal behavior, simply press "Standing up".
Not compatible with 32 bit devices (4, 4S, 5, 5C etc).
Doesn't work on FaceTime/stock Camera app