Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works better than expected

I started out doing the clinically recommended dose of 20-30 minutes every day in the mornings. When I started having some of the symptoms of overuse I adjusted. I found it's better for me in the evening and I sit further away. But I only need it a couple times a week. If I don't do it for days and the winter blues start hitting me I can do a fuller dose in the evening and I'll sleep great and wake up in a great mood. Seriously as someone who has had severe seasonal depression my whole life I can't describe what a great product this is.