I forgot to take my medicine this morning.
My legs have been hurting since I woke up this morning, so I can't move as much as I'd like.
This morning there was a multi-vehicle accident here.
Now morning is just another way of saying this morning. It's the closest morning to right now!
This reading is an exception. Let's use this mnemonic to remember it:
This morning you want a quesadilla (けさ) for breakfast. You can't wait until tomorrow morning, you NEED it this morning! Imagine eating a delicious quesadilla first thing this morning. Mmm!