[TeMPOraL]

I once saw one accidentally, when I was lying in a garden around 03:00 just watching stars. Checked at HeavensAbove afterwards to confirm I haven't just imagined it.

I used to do a lot of Iridium hunting in high school, sometimes waking up at 04:30 to spot the morning ones (which, given that I also stayed up/was waking up early sometimes to watch Shuttle launches/landings on NASA TV - in my timezones they were often in the middle of the night - pretty much ensured that I was often quite sleepy at school).