I have a long term and very stubborn sleep problem attached to my ME/CFS. The second night using ‘Slim’ headband I was excited to reduce my sleeping pills. I also have distressing brain fog symptoms. After 40 days of Slim, I suspect that it is helping somewhat - an unexpected bonus. - focus/ concentration a bit better with chatting to family and interacting with my daughter - less pressure headaches and less eye strain - customer services have been brilliant. I have just had my Slim changed to the Sleep headband today, because at the time of purchasing Sleep wasn’t yet released. My continued problem of waking during the night is still bad. My hopes are high that this will help. PS Working the headband alongside the app in my phone couldn’t be easier.