I hesitate to post this, in fear that it may quit working. For the last 10 days I have had a diffuser and the Twins bedroom. It has had cedarwood and lavender in it and it runs for 3 hours in their room.
I started when we start reading books for bedtime and by the time their light has gone out , they are quiet and not jumping around and playing like they had been in the past.
It is amazing!
I usually put about 4 drops of cedar wood and 4 drops of lavender in the diffuser.