Glad you are ok. That really isn't the recommended technique for waking up in the morning, even if it is effective.
I had a problem with a travel mug, and found out in the same way. Turns out water was getting inside the gap between the plastic outer and metal inner, while in the dishwasher, and adding a hot liquid caused a pressure build up.
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plus one to this, i have one very similar but with folding handlesmee too, but it only cracked the plastic.
This is the sort you want, if you bust have a metal cup , or an insulated one, .
www.gooutdoors.co.uk/hi-gear-stainless-steel-0-3l-camping-mug-p142469
bomb proof, including the handle, no cheap plastic.
Mmmmm, if only they made them from titanium.