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Your pharmacist might be able to recommend an over-the-counter sleeping aid, but you should not drink when taking it. Some people find having a glass of warm milk or Chamomile tea relaxing before bedtime.
Lifestyle changes that include a healthy diet can help to lower both triglycerides and your cholesterol levels.
More information here: https://www.everydayhealth.com/heart-health/diet-tips-to-reduce-high-triglycerides.aspx