It is going to be one in a year at most so you shouldn't take risks by using low quality canvas.
Your first two to your above list are critical because deep sleep and REM are the two most important stages of sleep. The in most cases used are lavender and rosemary. https://www.Pressadvantage.com/story/70250-cool-blew-inc-expands-emergency-ac-repair-services-in-phoenix-to-combat-summer-heat