Lavender is particularly helpful for Insomnia, Lavender bag, (small otherwise overpowering)
placed under a pillow or between two pillows if you are filthy rich like me and can offord to sleep on two

then the top one turned over, have a calming effect and can help relax you.
Usualy of course by bedtime I am semi conscious from Aperitif, Wine and Digestive but the Memsahib swears by it, or was it at me? never sure

Meldrew