The cheap scents disappear in different ways in my wardrobe.
Inexpensive scents, I do if I know I can buy more easily, however most often I scent my bed with Frankincense, Sandalwood which tend to be the more expensive. Part of that is because I am older and have less time to enjoy all my wardrobe, particularly the expensive.
Yes. I study late at night. Di Ser has been a godsend to quell mindracing and curb mild OCD. Otherwise I will have the same problem sets scrolling through my mind’s eye like a trip on the Willy Wonka tunnel ride until 3 am.
l spray along the top edge of my duvet cover rather than my pillow. That way the scent is right under my nose rather than behind my head.
l've found one has to careful in choosing which fragrances to use though, as the wrong choice certainly can keep one awake.
Favourites for me are Samsara, L'Heure Bleue, & Nag Champa by Ava Luxe. These are all very soothing to me, & if l wake during the night, l can sniff contentedly until l drop off back to sleep again.
Never so far-while usually the SOTD application and even overpspraying rate personally used is in most cases enough to scent the pillow and/or pillowcase anyway even if inadvertently.
And therefore also to contribute at least in part/inadvertently to any possible improvement of sleep as well as of falling asleep.
Haven't ever sprayed anything directly on my pillow, but we have a diffuser that we like to put fragrance in. Usually inexpensive scents, or samples we don't want to wear. CK One Shock, for example, makes the room smell delicious.