
Sorry you didn't have a chance to take your BG, but possibly that's a sign right there - high BG can cause tiredness.
Unfortunately NSA ice cream is usually actually *higher* carb than regular ice cream...all the kinds I've found have around 4-5g more carbs per 1/2 cup than the sugar-added flavors. Add strawberries to that & you've got even more carbs.
If there is a next time, maybe set an alarm to remind you to test (and to wake up to test if you get sleepy again.)