Neck pain from irregular sleeping is often due to muscle strain or poor posture during rest. To help relieve your discomfort, try applying a warm compress to the neck area, maintain good posture, and ensure your sleeping position supports your neck properly.

• Consider gentle neck stretches and avoid sudden movements.
• Over-the-counter pain relief like a muscle relaxant combined with painkillers may help, but only under a doctor's guidance.
• If pain persists beyond a week, worsens, or is accompanied by numbness or weakness, see an orthopedic specialist.

If you want, I can explain how to improve your sleeping posture or suggest specific exercises. Meanwhile, consulting an orthopedic doctor would be advisable for personalized care.To narrow down potential causes, we will need some more information.Please tell me your age and gender.