Question for AT&T cable users?

-How often does At&T do those pop ups at like 12:00 in the morning that allows the users to get free move channels sometimes free hd channels for free for like 2 weeks?This is very unscientific, but I think I've seen that maybe twice in the 15 months I've had U-Verse.

================

Followup: I just received an e-mail from U-verse announcing a free HBO & Cinemax period, June 24-27. (Which reminded me that U-verse customers get announcements of those free periods via e-mail.) See the link.