To talk to my mother.
Who is NEVER UP this early anymore.
Back in the day, she'd be up around 4, 4:30, but that time has slipped over the past year or two until it's more like 7.
You would think my sister would get the point by now and call later. Driving me up the wall.
On the other hand, it does have the tendency of waking up my mother so she can be there when the phone rings again. =P
Other downside, is my dad's current job often has him working until 1am, and he's not asleep 'til 2am, so four hours later, there's a phone call coming in, and he'll usually crawl out of bed too.