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I will generally use this after a shower, just before I go to bed. I find it smells nice, doesnt leave any noticible residual on my pillow, and doesnt irritate my skin. The smell is strong at first, and then over time fades away, which I think is nice, as you dont want your pillow to have an enduring overpowering smell of you and the pillow spray. I have been using it a while now and find that as part of my routine it is a trigger to relax and settle down for the evening. I wouldnt expect this product to be a cure-all for anyone with sleep issues, but it is something in the toolbox to help you relax at the end of the day.
You have to like the smell of lavender to use this product but I absolutely swear by it! I always spray my pillow with it before I go to bed and my sleep has definitely improved. This got me through some restless nights during lockdown.