Sleep Medicine Director

Dr. Cordelia Ashworth

Dr. Cordelia Ashworth is a board-certified sleep medicine physician with over 15 years of experience at Stanford Sleep Medicine Center. She has published extensive research on circadian rhythms and light exposure.

Sleep DisordersCircadian RhythmsSleep MasksLight Therapy

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Product Reviews by Ashworth

Product Review

Best Sleep Masks

After testing 47 sleep masks over 6 months, we have identified the best options for light blocking, comfort, and durability. From contoured 3D designs for side sleepers to luxurious silk masks and innovative weighted options, our expert picks help you achieve complete darkness for better sleep quality.

Dec 2, 202510 products reviewed

Guides by Ashworth

Pillows

How to Choose the Right Pillow for Your Sleep Position (2025 Guide)

Learn how to select the perfect pillow based on your sleep position, body type, and personal preferences. Expert tips for side, back, and stomach sleepers.

12 min readNovember 15, 2025

Sleep Health

Melatonin for Sleep: Dosage, Timing, Benefits & Side Effects

Complete guide to melatonin supplements for sleep. Learn proper dosage, timing, benefits, side effects, and who should avoid melatonin.

11 min readDecember 3, 2025