I had a spate of these a few years ago, having never had them before (I have migraines without auras and when I have auras the pain isn't as bad if it's there at all). Then they disappeared. Now they are back again and I can get them every day or several times a week or, like this morning, twice. In fact I was dreaming I had an aura and nobody could hear me telling them I had one and turns out when I woke it was an actual one. Then slept a bit and then woke with one again though not so bad
I don't know why they're being triggered again. Maybe need to spend less time on computer.