Dr. Stuart Gitlow, a psychiatrist, traveled this month to the Westin Peachtree Plaza in Atlanta for a presentation at a conference about treating drug addiction.

During his three-night stay, he dispensed with housekeeping.

“I don’t need my bed made every day and can certainly use the same towel three mornings in a row,” he wrote in an email.

Dr. Gitlow was rewarded for his green efforts with 500 Starwood Preferred Guest loyalty points for each night of his stay. Had he not chosen points, he also had the option of receiving a $5 voucher for food.

The program, called Make a Green Choice, allows all guests, not just frequent travelers, to opt out of housekeeping. According to Starwood Hotels and Resorts, approximately 6.4 million guests have participated since 2009.