Houston can be really bad this time of year. In May I flew DEN-IAH and the captain ordered the flight attendants to their seats about 10 minutes before landing. The FAs were not able to to the seatbelt fastened/upright seatback walkthrough. They went on the PA system and said we were on the "honor system" and if the person sitting next to you was asleep, please wake them up and ask they fasten their seat belt and put their seat on the upright position. I thought it was kind of funny.