Forgive me for not answering your question (I'd prefer not to for reasons related to career).

This is relevant to my interests though, and I hope you won't mind me asking when, approximately, in college they did start? Are they frequent still? Have you noticed any kind of pattern to them?

I ask because these things are pretty poorly understood as far as sleep disorders go, and any additional info, no matter if anecdotal is a benefit to me.