A sleeping method for a participant having a foot end and a head end including 1)providing a sleeping surface having upper and lower ends, the sleeping surface inclined at least 10-25 degrees from the upper end to the lower end, 2)providing a predetermined unit of time having successive nightly sleep periods, and 3)the participant sleeping on the sleeping surface in a head down position for at least half or other portion of the successive nightly sleep periods, the head down position comprising the participant laying down on the sleeping surface with the legs and feet of the participant disposed toward the upper end of the sleeping surface and the head end of the participant disposed toward the lower end of the sleeping surface, in which the feet end of the participant is upward relative to the head end of the participant.