I designed and made sachets to be given away as gifts. I filled them with good night sleep herbs from my award winning arctic garden. I've made these several times. I have made also easy tutorial for you to make your own.
Excellent and easy to find/buy or grow herbs for good night and relaxing sleep are for example hops and lavender, but also rose petals. For your recovery and resilience it is very important to have enough sleep, at least rest. Sachets with potpourri including calming and relaxing ingredients help you to settle and slow down.