Allow your body to rest with hands by your sides or on stomach. You can place pillows under your upper thighs or behind knees for more support if desired. With eyes closed and jaw and torso relaxed, feel your breath filling up your belly, expanding your ribs, and flowing up into the chest on an inhalation. Exhale by relaxing your chest, ribs, then belly. This breath is called Dirgha pranayama (Complete Breath). Allow this wave-like rhythm to lull you to sleep.