I doubt you would get much of a BG rise out of a tablet, most tablets are sugar coated to make digestion more pleasant, but not enough to send blood levels soaring.
I take Boots own version of these very occasionally as have chronic insomnia, The kalms one don’t work for me. I see no difference in my BG when I do take them. But I’m T2 dit only so can’t really comment on how it would affect T1 on insulin.
The complete no sleep over 3 or 4 days affects my BG more