Laying your head against the headboard for long periods of time is unlikely to cause your skull to flatten or cause any significant damage. The human skull is a rigid structure that protects the brain, and it is not easily deformed under normal circumstances.
The skull is composed of several bones that are firmly fused together, forming a sturdy protective casing for the brain. The brain itself is cushioned by cerebrospinal fluid, which helps absorb and disperse impact forces.
However, if you maintain an awkward or uncomfortable posture for extended periods, you may experience discomfort in your neck or head, such as muscle tension, soreness, or headaches. It's essential to maintain good posture and take breaks to relieve any potential strain.
If you have specific concerns about head and neck health or are experiencing persistent pain or discomfort, it's advisable to consult a medical professional or a chiropractor for a proper assessment and personalized advice. They can provide guidance on maintaining good posture and reducing any potential risks associated with prolonged positions.