Last year, Six Senses Spa—at the Alpina Gstaad, 56-room hotel in the Swiss Alps—launched a sleep program so popular the spa decided to bring it back for another year.

Two yoga practices are combined, geared specifically toward bettering one’s sleep: nidra (Hindi for “sleep”), an ancient form of guided meditation; and hatha (“willful” or “forceful”), a strengthening sequence of physical exercises that promote alignment. A therapist discusses the needs and issues of each participant before leading everyon…