Shavasana is a yoga pose in which you lie flat on your back, completely still, with your eyes closed. The name comes from the Sanskrit words “shava,” meaning corpse, and “asana,” meaning posture. Despite looking like the simplest pose in any yoga class, it serves a specific physiological purpose: shifting your nervous system from a stress-driven state into deep relaxation.
What Happens in Your Body
When you lie motionless in Shavasana, the combination of stillness, conscious breathing, and closed eyes triggers your parasympathetic nervous system, the branch responsible for rest and recovery. At the same time, activity in your sympathetic nervous system (the one behind your fight-or-flight response) decreases. This shift is measurable: heart rate drops, blood pressure lowers, and your body reduces its output of cortisol, the primary stress hormone.
These aren’t just temporary effects. Regular yoga practice that includes relaxation postures has been linked to systolic blood pressure reductions of about 10 mmHg and diastolic reductions of about 6 mmHg when combined with standard medical treatment. Multiple studies have also confirmed that consistent yoga practice lowers both plasma and salivary cortisol levels, which helps regulate the body’s stress response over time.
What Happens in Your Brain
Lying still with your eyes closed changes your brain’s electrical activity. During relaxation and meditation, the brain shifts toward slower wave patterns, particularly in the theta range, which is associated with internalized attention and emotional processing. This is the same type of brain activity that increases during meditation, and it helps explain why Shavasana often produces a noticeable mental “quieting” that feels different from simply resting on a couch.
Research on anxiety supports this. In one study comparing two yoga-based relaxation techniques, state anxiety scores dropped significantly after both methods, with reductions ranging from about 6% to 22% in a single session. That immediate calming effect is part of why Shavasana typically closes a yoga class: it consolidates the physical and mental benefits of the practice that preceded it.
The Six-Minute Threshold
Most yoga teachers recommend staying in Shavasana for at least 10 minutes. There’s a practical reason for this. According to experienced instructors, something shifts around the six-minute mark. The body’s weight seems to drop more fully into the floor, and the mental chatter that runs through the first few minutes begins to genuinely quiet. Before that point, you’re relaxing. After it, your nervous system settles into a deeper state that feels qualitatively different.
If your yoga class only gives you two or three minutes of Shavasana, you’re getting some benefit but likely missing this deeper shift. When practicing at home, aim for the full 10 minutes if you can.
Shavasana vs. Yoga Nidra
Yoga Nidra is performed in the Shavasana position, which leads to some confusion between the two. The difference is depth. Standard Shavasana is passive relaxation: you lie still and let your body and mind settle. Yoga Nidra uses a guided script to systematically move your awareness through the body and into progressively deeper states of consciousness. Practitioners appear to be asleep, but their awareness is still active at a deep level.
The neurological differences are striking. One brain imaging study found that during Yoga Nidra, dopamine release in the brain’s reward center increased by 65%, a response correlated with significant increases in theta brain wave activity. Separate imaging research showed differential activity in brain regions involved in visualization tasks during Yoga Nidra, suggesting the practice engages the brain in ways that go well beyond simple rest. Think of Shavasana as the entry point and Yoga Nidra as a much deeper journey that begins from the same position.
How to Practice Shavasana
Lie on your back on a firm, comfortable surface. Let your legs fall open naturally, about hip-width apart, with your feet relaxing outward. Place your arms alongside your body with your palms facing up. Close your eyes. The palm-up position is deliberate: it opens the chest slightly and signals to the body that there’s nothing to grip, hold, or do.
Breathe naturally. You don’t need to control your breath or follow a pattern. The goal is to remain awake but completely passive, letting go of conscious effort to control anything. If your mind wanders (it will), notice it without judgment and let the thought pass. The practice is in the returning, not in achieving a perfectly blank mind.
Modifications for Comfort
Low back pain is the most common reason people struggle with Shavasana. Placing a bolster or rolled blanket under your knees takes pressure off the lower spine by allowing a slight bend in the legs. If you feel exposed or cold lying on your back, covering yourself with a light blanket can help your body relax more fully, since body temperature drops during deep rest.
During pregnancy, lying flat on your back can compress a major blood vessel called the inferior vena cava, reducing blood flow to the baby. Most experts recommend modifying Shavasana after week 16 to 20 of pregnancy. The simplest option is lying on your side with a pillow between your bent knees. Alternatively, you can create an inclined position using a bolster propped on yoga blocks, so your upper body rests at a gentle angle rather than flat. If you don’t have yoga props, pillows and folded blankets work just as well.
Why People Skip It (and Shouldn’t)
Shavasana is the pose most likely to be cut short or skipped entirely. Lying still with nothing to do can feel uncomfortable, even agitating, especially for people carrying high levels of stress or anxiety. That discomfort is itself informative: it reflects how strongly your nervous system resists shifting out of its alert, task-oriented mode.
One study found Shavasana to be as effective as biofeedback therapy for reducing the severity of tension headaches over a four-week period. That’s a notable comparison, since biofeedback involves specialized equipment and clinical sessions. The fact that simply lying still and relaxing produces equivalent results speaks to how powerful this deceptively simple pose can be when given adequate time.