Fatigue is another common symptom of type 1 diabetes. You may often feel tired, regardless of how much you have eaten, because your cells are not able to use the glucose that is broken down from the food.
If you're needing to make a lot of trips to the bathroom at night, this can also disrupt your sleep. Waking up multiple times throughout the night could mean you aren't able to get a restful sleep, leaving you to feel tired throughout the day. This ongoing fatigue can make you easily irritable. It's no wonder why you may be feeling more grumpy than usual!