After i take glucosamine at night time when sleep and feel stomach upset?

Glucosamine: Try taking the glucosamine after breakfast, lunch or supper and not when the stomach is empty. If symptoms persist, discontinue it. If the symptoms continue, then you may be dealing with gastritis,peptic ulcer, food intolerance( lactose or gluten) or irritable bowel syndrome. Consult your physician or a gastroenterologist for evaluation. Appropriate tests will be ordered. In the meantime observe.