1. If the Environment is Cold (e.g., sleeping in an air-conditioned room or outdoors):
- · Joint Stiffness: Severe cold can cause blood vessels to constrict, reducing blood flow to the tissues around the joint. This leads to knee stiffness and difficulty moving it upon waking up.
- · Worsening of Joint Pain: If a person suffers from chronic inflammation (such as osteoarthritis), the cold can significantly increase pain and morning stiffness.
- · Muscle Cramps: The muscles surrounding the knee (like the hamstrings and quadriceps) may cramp due to the cold, causing sharp pain and restricting movement.
2. If the Environment is Hard or Uncomfortable (e.g., sleeping on the floor or a very firm surface):
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