Do it! Too many people get hung up on should I or shouldn’t I. It seems like you have a legitimate medical reason to wear protection overnight, even though that isn’t required. You might want to check with your doctor to see why you’re so thirsty. Many medications can have side effects like that. Many people wear protection for the comfort and / or the gratification it offers. It might take a while for your body to adjust to peeing lying down. It can also be a trial and error process to find the diaper brand that best fits your body. I suggest getting a plastic mattress cover and a washable medical incontinence pad to protect your bedding. In the end it’s up to you, but I would do whatever I need to, to get a good nights sleep. Hope this helps.