Free Sheraton Night for Every Five Paid Sheraton Nights. Gameable?

Starwood Preferred Guest has two summer promotions that should be stackable, and for some people, the value of the promotions will make mattress running a viable option.

The first promotion--Make It Count--offers 1,000 bonus Starpoints for each eligible 2+ night stay that includes at least one weekend night. Eligible stays must be completed by August 31, 2015.