It is generally not recommended to sleep on your stomach after undergoing SPATZ adjustable balloon treatment procedure. The adjustable balloon is placed in the stomach to promote weight loss by creating a feeling of fullness. Sleeping on your stomach may put pressure on the balloon and potentially cause discomfort or affect its position within the stomach. It is best to follow the specific instructions provided by your healthcare provider regarding post-treatment care, including sleep positions. If you have any concerns or questions, it is always advisable to consult with your healthcare provider or the medical team who performed the procedure.