The Bad Mood...a wretched way to feel starting out the day. Adding sugary cereal and/or sweets might make it worse, if you have a mood altering sugar sensitivity because sugar can change your body chemicals. Ever know anyone that misbehaves when they drink too much rum (sugar based) or hard cider (sugar based)? The anger - sugar connection has been around a long time. I watched a Rick Steves episode about a hard cider drink called scrumpy that's been banned or not served in places in the United Kingdom. Moderation is the key when having sugary foods and/or drink.
So are sweet dreams the cause of waking up with a bad mood? I don't think so. I believe not having enough sweet sleep is more the problem. At this time of year with food and drink being a large part of the celebratory traditions, its a good time to think about what is and what isn't going to sweeten your life.
Apples any time of year are a favorite fruit. As a replacement for ketchup, I've been using unsweetened applesauce. For me, Thanksgiving isn't right without cider. I remember my first turkey dinner away from home looking for the cider. I was shocked, stunned, shaken to learn there are people that don't have cider at Thanksgiving. Gives me the chills to think about it. I will not give up the cider.
Sugar Allergy ?
Sugar Intolerance ?